单项选择题

A．Because every species become extinct.
B．Because human beings are powerful enough to kill other species.
C．Because of over-population.
D．Because human being is still a young species though it is exploiting the environment.
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单项选择题
A．They could drive the insects away.B．They could keep the plants well-watered.C．They could make the plants grow faster.D．They could build devices to trap insects.
A．They could drive the insects away.
B．They could keep the plants well-watered.
C．They could make the plants grow faster.
D．They could build devices to trap insects.
单项选择题
A．Both are fast-moving sports.B．Both depend on good tactics.C．Both provide a lot of exercise.D．Both require a lot of training.
A．Both are fast-moving sports.
B．Both depend on good tactics.
C．Both provide a lot of exercise.
D．Both require a lot of training.
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