[单项选择]With the population explosion, scientists will have to（）new methods of increasing the world’s food supply.
A. come up with
B. carry out
C. lead to
D. stick to

[单项选择]With the population explosion, scientists will have to ______ new methods of increasing the world’s food supply.
A. come up with
B. carry out
C. lead to
D. stick to

[填空题]With the help of computer programs, scientists have predicted that the earth will continue to get warmer in the future.

[简答题]Like the population explosion, the scientific and technological revolution began to pick up speed slowly during the eighteenth century. And this ongoing revolution has also suddenly accelerated exponentially. For example, it is now an axiom in many fields of science that more new and important discoveries have taken place in the last ten years than in the entire previous history of science. While no single discovery has had the kind of effect on our relationship to the earth that nuclear weapons have had on our relationship to warfare, it is nevertheless true that taken together, they have completely transformed our cumulative ability to exploit the earth for sustenance—making the consequences of unrestrained exploitation every bit as unthinkable as the consequences of unrestrained nuclear war.

[单项选择]
Lately social scientists have begun to ask if culture is found just in humans, or if some animals have a culture too. When we speak of culture, we mean a way of life a group of people have in common. Culture includes the beliefs and attitudes we learn. It is the patterns of behaviour that help people to live together. It is also the patterns of behaviour that make one group of people different from another group.
Our culture Lets us make up for having lost our strength, claws, long teeth, and other defenses. Instead, we use tools, cooperate with one another, and communicate with language. But these aspects of human behaviour, or "culture", can also be found in the lives of certain animals. Animals Can Make Tools
We used to think that the ability to use tools was the dividing line between human beings and other animals. Lately, however, we have found that this is not the case. Chimpanzees can not onl
A. A chimpanzee can learn to use sign language to make sentences.
B. Other animals can invent tools.
C. Sharing and cooperating are no longer signs of only human behaviour.
D. The line dividing human culture from animal culture is not as clear as we might think.

[填空题]explosion

[单项选择]Scientists are eager to talk with other scientists working on similar problems.
A. 科学家热衷于与从事类似课题研究的其他科学家交流。
B. 科学家更容易与其他科学家谈话来解决相同的问题。
C. 科学家很乐意在解决类似问题时同其他科学家交流。
D. 科学家更容易就雷同的问题与其他科学家交流。

[简答题]
1 Population ecology is the science that measures changes in population size and composition and identifies the causes of these fluctuations．Population ecology is not concerned solely with the human population．In ecological terms．a population consists of the individuals of one species that simultaneously occupy the same general area．rely on the same resources, and are affected by similar environmental factors．The characteristics of a population are shaped by its size and by the interactions among individuals and between individuals and their environment．
2 Population size is a balance between factors that increase numbers and factors that decrease numbers．Some factors that increase populations are favorable light and temperature，adequate food supply, suitable habitat, ability to compete for resources, and ability to adapt to environmental change．Factors that decrease populations are insufficient or excess

[单项选择]
1 Population ecology is the science that measures changes in population size and composition and identifies the causes of these fluctuations．Population ecology is not concerned solely with the human population．In ecological terms．a population consists of the individuals of one species that simultaneously occupy the same general area．rely on the same resources, and are affected by similar environmental factors．The characteristics of a population are shaped by its size and by the interactions among individuals and between individuals and their environment．
2 Population size is a balance between factors that increase numbers and factors that decrease numbers．Some factors that increase populations are favorable light and temperature，adequate food supply, suitable habitat, ability to compete for resources, and ability to adapt to environmental change．Factors that decrease populations are insufficient or excessive
A. uneven resource distribution
B. territorial disputes
C. mating behavior
D. safety from predators