They indicate that sediments found during an ice age contain more calcium carbonate than sediments formed at other times.
They are less reliable than the evidence from rocks on land in determining the volume of land ice.
They can be used to deduce the relative volume of land ice that was present when the sediment was laid down.
They are more unpredictable during an ice age than in other climatic conditions.
They can be used to determine atmospheric conditions at various times in the past.
第1题:
第2题:
第3题:
It indicated that lighter isotopes of oxygen predominated at certain times.
It had far more gaps in its sequence than the record taken from rocks on land.
It indicated that climate shifts did not occur every 100,000 years.
It indicated that the ratios of oxygen 16 and oxygen 18 in ocean water were not consistent with those found in fresh water.
It stretched back for only a million years.
第4题:
Italy.
Spain.
Greece.
France.
第5题:
Email reduces other forms of contact.
Email enhances other forms of contact.
About 25% of network members are contacted by email weekly.
With email, people try hard to maintain more relationships.
第6题:
The women having children show a rise in cold infections than those without children.
People with low income will surely more colds than people with high income.
Juniors are easier to have colds than seniors.
It has not been proved scientifically that poor nutrition affects susceptibility to colds.
第7题:
It is very difficult for the middle-aged to live in America.
America is Kids Country because the majority of the American population is children.
Kids Country was taking shape in America when immigrants poured into the country.
America is more of Kids Country than any other countries in the world.
第8题:
We will be in trouble if our fat cells become less responsive to insulin.
More and more studies are done to study the link between sleep and weight.
More than 20% of Americans are not getting enough sleep.
Fat cells are there to help us maintain a good health.
第9题:
Smell is the most emotional of the senses.
Smell stimulates our memory more than the other senses.
Smell is considered to be mysterious, as it is untouchable.
Smell is the most difficult sense to identify.
第10题:
Most voters support the government's effort to help young people to work.
Some people protest against the government's attempt to force young people to work.
There are more than one million young people who took part in the program.
There are more than one million young people who are jobless.
第11题:
the author is the first child of the family
his family led a very hard life
his mother gave less attention to him
his mother treated him as more than an assistant
第12题:
People in allocations are unwilling to conform to a general pattern.
Conformity is a special characteristic of business.
Businessmen are all original thinkers.
Businessmen are provided with greater opportunities than people in other professions.
第13题:
第14题:
They were originally intended to be children's stories.
Generally speaking, the tales that have endured can help children deal with the challenges life bring to them.
A large number of the tales made it to the modem age.
They are less violent than the children's stories being written today.
第15题:
The Boston Tea Party took place in 1773.
Europeans figured out ways to use coffee during the 1670s.
During the 1770s, more and more Americans began to drink coffee.
Coffee is a refreshing drink.
第16题:
Women usually suffer from osteoporosis when advanced in years.
Women tend to be anemic more than men due to menstruation.
Gallbladder disease afflicts fewer women than men.
Food high in soy protein can lower cholesterol.
第17题:
Not all the fires in the forests must be put out.
People‘s carelessness leads to dangerous fires.
Australia allows all the fires to burn naturally.
There are more fires in Russia than in the USA.
第18题:
They are natural endowments to living creatures.
They are more important than instincts to all animals.
They are subject to the formative influence of the environment.
They are destined to open out a much more far-reaching possibility in the evolution of human beings.
第19题:
She is married to a school teacher.
Her eyes move around a lot at times.
She is ten years older than Jerome.
She has found what she is looking for.
第20题:
The Boston Tea Party took place in l773.
Europeans figured out ways to use coffee during the 1670s.
During the l770s, more and more Americans began to drink coffee.
Coffee is a refreshing drink.
第21题:
Italy
spain
France
Greece
第22题:
Swimming across the Channel takes less than four hours.
The idea of a Channel tunnel or bridge is a very new one.
It is considered to be more difficult to swim across the channel than any other means.
A tunnel or bridge would only reach as far as the coast.
第23题:
A computer model
Studies show ice melted equally in the North and the South during the ice age
Most of the ice melted in the Northern hemisphere during the 30,000-year long ice age
A survey result