单选题Prolonged and unseasonable frosts produce frost rings in deciduous trees, which grow in moderate climates. Frost rings do not appear in any of the fossilized deciduous trees that have been found in Antarctica. Hence, it is unlikely that such frosts occ

题目

单选题

Prolonged and unseasonable frosts produce frost rings in deciduous trees, which grow in moderate climates. Frost rings do not appear in any of the fossilized deciduous trees that have been found in Antarctica. Hence, it is unlikely that such frosts occurred in Antarctica at the time the fossilized trees lived.　 Which of the following is an assumption on which the argument depends?

There are fossilized nondeciduous trees from Antarctica that bear frost rings.

Deciduous trees are more likely to bear frost rings than are other tree varieties.

The process of fossilization does not completely obscure frost rings in deciduous trees.

Present-day deciduous trees are more sensitive to changes in temperature than were the deciduous trees of ancient Antarctica.

Prolonged and unseasonable frosts that might have occurred in Antarctica when the now-fossilized trees were still living did not always produce frost rings in deciduous trees.

相似考题

1.4．— Did you have anyone ______the trees?—Yes，l had the trees ______．A． to water ;waterB． to water; wateredC． water ; to be wateredD． water; watered

2.Which of the following usually causes a tree to grow unhealthy?A. Giving a tree a special shape and a definite height.B. Removing small side branches and making a tree look less thick.C. Allowing too many branches to grow in the middle.D. Having a tree surrounded by many other trees.

3.AWhy do plants grow in some places and not in others? Why does some land have so much growing on it，while other land has almost no plants growing on it at all?To grow plants need several things． One is warmth． In very cold places almost nothing grows． Plants also need water． In very dry parts of the earth only a few unusual plants can grow． That's why dry deserts everywhere are almost not covered by trees or grass．Plants must also have a place in which to f，ut down their roots and grow． They find it diffi-culr to grow on hard land． The town is built on hard land． The plants here have only the soil found between the cracks of the stones Io grow in．Another thing plants must have before they can grow is food．Whar will happen if we try to make things grow on the sandy beach? A few plants，such as beach grass，will grow in sand，L ut most plants won-t． Even if the weather is warm enough．and we water the plants each day． Many of them will die because the sand on this beach has al-most no food for plants．( )21． According to the passage，plants need _________ things to grow well．A． twoB． threeC． fourD． five

4.If the phone rings again, I () it.A、ignoreB、will ignoreC、will have ignoredD、would have ignored

更多“单选题Prolonged and unseasonable frosts produce frost rings in deciduous trees, which grow in moderate climates. Frost rings do not appear in any of the fossilized deciduous trees that have been found in Antarctica. Hence, it is unlikely that such frosts occ”相关问题

第1题：

Among the rings of a piston the ______one is subjected to the greatest load and temperature.
A.bottom
B.middle
C.top
D.any position

正确答案：C
第2题：

We found shelter from the rain under the trees.

A: defense
B: standing
C: protection
D: room

答案：C
解析：
题干意为“我们躲在树下避雨。” 句中划线词为名词，意为“庇护，掩蔽处”。C项protection意为“保护”，例句：Every citi- zen may claim the protection of the law．每个公民都可以要求受到法律的保护。A项意为“防卫，防护”,B项意为“名声，地位”,D项意为“房间，空间”，故选C。
第3题：

If the phone rings again, I（）it.
Aignore
Bwill ignore
Cwill have ignored
Dwould have ignored

B
略
第4题：

单选题
It was difficult to（）how many trees had been destroyed.
A
occupy
B
test
C
estimate
D
evaluate

正确答案： C
解析：暂无解析
第5题：

单选题
If due to thick and hard deposits of carbon, the piston rings cannot move freely in their grooves, dark areas will often appear on the upper part of the cylinder wall (may not be the risible at port inspection)What condition of the piston rings can result in this phenomenon?（）
A
micro-seizure
B
sticking
C
scratched
D
breakage/ollapse

正确答案： B
解析：暂无解析
第6题：

单选题
If the phone rings again, I（）it.
A
ignore
B
will ignore
C
will have ignored
D
would have ignored

正确答案： D
解析：暂无解析
第7题：

单选题
The piston rings if found worn out （） and supplied by shipchandler.
A
must replace
B
must to be equipped
C
has to be repaired
D
have to be renewed

正确答案： A
解析：暂无解析
第8题：

单选题
When good and steady service conditions have been achieved, the running surfaces of the piston rings and cylinder liner will be（）In addition, the rings will move freely in the grooves and also be well oiled intact, and not unduly worn.
A
hazy light
B
hazy light brown
C
hazy light blue
D
hazy light grey

正确答案： C
解析：暂无解析
第9题：

单选题
Trees become unhealthy if the gardener _____.
A
allows too many branches to grow in the middle
B
does not protect them from wind
C
forces them to grow too quickly
D
damages some of the small side branches

正确答案： D
解析：
第二段最后一句“The health of a tree may be encouraged by removing branches that are blocking up the centre”说明，剪去阻塞树木中央空间的枝条可使树木健康生长，相反，保留这些枝条则会导致树木长得不健康。
第10题：

共用题干
Forests for Cities
You are standing in a beautiful forest in Japan. The air is clean and smells like plants and flowers.There are 175 different kinds of trees,and 60 kinds of birds live here.______(1) You are downtown in the city of Nara,Japan,in Kasugayama Forest,the oldest urban forest in the world.It was started more than a thousand years ago,and today it's very popular with tourists and artists.
Cities around the world are working to protect their urban forests. Some urban forests are parks,and some are just streets with a lot of trees.But all urban forests have many good effects on the environment.______(2)They also stop the noise from heavy traffic.They even make the weather better because they make the air 3-5 degrees cooler,and they stop strong winds. Urban forests also have many good effects on people. They make the city more beautiful. In a crowded area,they give people a place to relax and spend time in nature.______(3)
In some countries,people are starting new urban forests. In England,there are now 1.3 million trees in an urban forest called Thames Chase,east of London. It was started in 1990, and it has grown very fast.Walking and bicycle clubs use the forest,and there are programs for children and artists.______(4)
Some older cities don't have space for a big urban forest,but planting trees on the streets makes the city better. Scientists found that commuters（通勤人员）feel more relaxed when they can see trees.Trees are even good for business.______(5)In the future,urban forests will become even more important as our cities grow bigger. In the megacities（超大城市）of tomorrow,people will need more green space to live a comfortable life. Planting trees today will make our lives better in the future.

______(5)
A: People spend more time at shopping centers that have trees.
B: In hot countries,urban forests are cooi places for walking and other healthy exercises.
C: But you are not in rural area.
D: Trees take pollution out of the air.
E: In 2033,it will have 5 million trees.
F: It has many kinds of birds in the country.

答案：A
解析：
从后面一句的“downtown”，可以看出，前面应该有和城市相对应的词。C项的rural是农村的意思。把C项填入后语义明确，说明奈良的城市森林覆盖率高，虽然会给你身在乡村的错觉，但这就是人家的城市风貌。所以选C。
前一句讲到城市森林对环境很有益，后一句“also”明显表明空缺的一句和 also所在句子讲述的都是具体的对环境有益的方面。所以选D。
在表达方式上，B项承接了前一句“In a crowded area, they give people a place to relax and spend time in nature.”，这两个是并列句。所以选B。
前面几句有几个关键词：now 1. 3 million trees,has grown very fast。作为本段的最后一句，一般要根据前文展望一下未来趋势。综合各个选项，E项比较合适。
从前一句Trees are even good for business可以看到，此句要具体说树木会如何促进商业活动。A项正合其意。
第11题：

Most of the butterflies perish in the first frosts of autumn.

A:die
B:disappear
C:migrate
D:vanish

答案：A
解析：
第12题：

Which statement is true about items that have been assembled into a kit？（）
- A、 Only rotating items can be part of a kit.
- B、 Kits can be assembled from lotted items.
- C、 Kits can be assembled from items in different storerooms.
- D、 Items that have been assembled into kits do not appear in item balances.
正确答案:D
第13题：

单选题
Paleontologists hypothesize that modern birds evolved from the family of dinosaurs that included Tyrannosaurus rex. This hypothesis would be strongly supported if evidence that dinosaurs from this family had a body covering resembling feathers could be found, but so far no such evidence has been found.　 Which of the following, if true, would most help the paleontologists explain why no evidence of feathered dinosaurs has yet been found?
A
Fossilized dinosaurs have shown many birdlike characteristics, such as bone structure and winglike arms.
B
If birds are in fact the descendants of dinosaurs, then it can be argued that the dinosaurs never really died out.
C
Flying dinosaurs such as the Pteranodon, which is not thought to have been related to modern birds, do not appear to have had feathers.
D
Soft tissues such as skin and feathers do not fossilize like bones, and therefore are far less likely to have left permanent evidence in the fossil record.
E
The thousands of dinosaur fossils excavated by paleontologists represent only a tiny fraction of the billions of dinosaurs that once lived.

正确答案： D
解析：
D项为未发掘到恐龙皮肤的原因提供了一个可能的答案，故D项是正确的。E项与问题的关联度不如D项，所以不选E项。
第14题：

单选题
A number of trees have been planted_________there was nothing a year ago but ruins.
A
where
B
when
C
before
D
until

正确答案： D
解析：
第15题：

单选题
Why do forests in many parts of the world slowly disappear?
A
New trees are not looked after properly.
B
Many trees have been cut down by man.
C
Man has not paid enough attention to planting trees.
D
All of the above.

正确答案： C
解析：
细节题。第二段列举了森林减少的原因。
第16题：

单选题
If an operating bilge pump is developing good vacuum, but is unable to discharge any water, which of the following problems is the most probable cause?（）
A
The wearing rings are excessively worn
B
The suction strainer is clogged
C
The discharge valve is clogged
D
The shaft is worn

正确答案： A
解析：暂无解析
第17题：

单选题
A number of trees have been planted ________there was nothing a year ago but ruins.
A
where
B
when
C
before
D
until

正确答案： A
解析：
第18题：

单选题
Which statement is true about items that have been assembled into a kit？（）
A
Only rotating items can be part of a kit.
B
Kits can be assembled from lotted items.
C
Kits can be assembled from items in different storerooms.
D
Items that have been assembled into kits do not appear in item balances.

正确答案： C
解析：暂无解析

单选题Prolonged and unseasonable frosts produce frost rings in deciduous trees, which grow in moderate climates. Frost rings do not appear in any of the fossilized deciduous trees that have been found in Antarctica. Hence, it is unlikely that such frosts occ

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更多“单选题Prolonged and unseasonable frosts produce frost rings in deciduous trees, which grow in moderate climates. Frost rings do not appear in any of the fossilized deciduous trees that have been found in Antarctica. Hence, it is unlikely that such frosts occ”相关问题

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