We can infer from Dr. Myers and Dr. Worm’s paper that ________.[A] the stock of large predators in some old fisheries has reduced by 90%[B] there are only half as many fisheries as there were 15 years ago[C] the catch sizes in new fisheries are only 20% o
题目
We can infer from Dr. Myers and Dr. Worm’s paper that ________.
[A] the stock of large predators in some old fisheries has reduced by 90%
[B] there are only half as many fisheries as there were 15 years ago
[C] the catch sizes in new fisheries are only 20% of the original amount
[D] the number of larger predators dropped faster in new fisheries than in the old
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第1题：
Our tradition ______ be different _____ yours.
A、can;with
B、must;with
C、need;as
D、may;from
正确答案:D
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第2题：
If it rains tomorrow, we ______ for a picniC. 一般现在时A. wouldn’t go out
B. can’t go out
C. won’t go out (will not)
参考答案：C
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第3题：
In some libraries young people can check out ten juvenile books at one time.A:adventure
B:large-print
C:hardcover
D:children's答案：D解析：本句意思：在一些图书馆年轻人可以一次同时查阅十本青少年书籍。adventure的意思 为“冒险的，惊险的”;large-print的意思为“用大号铅字排印的”;hardcover的意思为“精装的， 硬书皮的”;children' s的意思为“孩子们的”。juvenile的意思为“青少年的”，和children' s的 意思接近。 -
第4题：
We ______ booked. Look, this restaurant is almost empty.A. must have
B. can’t have
C. should have
D. needn’t have
答案：D
解析：根据题意选D。
本句意思：我们应该已经预订过了。看，这家餐厅几乎空无一人。
must have意思为：“必须已经”；can’t have“不能”；should have意思为：“应该已经”；needn’t have意思为：“不必”，
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第5题：
27．If we travel by car ,we_________．
A． can't travel fifty or one hundred miles a day
B． can-t stop at a hotel to spend the night
C． can make our own timetable '
D． can travel to a very far place in several minutes
正确答案：C
27．C【解析】从文章最后一段第一、二句可知． -
第6题：
现有学生社团管理数据库，其中包括基本表如下： 学生（学号，姓名，所在系）； 社团（社团编号，名称，成立时间，社长），其中社长由该社团中学生担任； 参加（学号，社团编号，参加时间，职务），其中若不担任任何社团职务，属性“职务”为空； 若要查询参加了学生“李明”所参加的所有社团的学生学号、姓名和所在系，正确的SQL语句是（）。
A.SELECT * FROM 学生, 参加 WHERE 参加.学号=学生.学号 AND 姓名='李明;#B.SELECT * FROM 学生 S1 WHERE 学号 IN (SELECT 学号 FROM 参加 WHERE 社团编号 IN (SELECT 社团编号 FROM 参加, 学生 WHERE 参加.学号=学生.学号 AND 姓名='李明'));#C.SELECT * FROM 学生 S1 WHERE NOT EXISTS (SELECT * FROM 参加 P1, 学生 S2 WHERE P1.学号=S2.学号 AND S2.姓名='李明' AND NOT EXISTS (SELECT * FROM 参加 P2 WHERE P2.学号=S1.学号 AND P2.社团编号=P1.社团编号));#D.SELECT * FROM 学生 S1 WHERE EXISTS (SELECT * FROM 参加 P1, 学生 S2 WHEA