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单选题

A．It can cause flooding
B．It can carry diseases that affect animals.
C．It can introduce too much salt into the soil.
D．It can divert water from important crops.

参考答案C

解析:According to the speaker, what is the main problem with irrigation?
细节题。根据Bringing in too much salty water and then not providing adequate drainage for it will fill the soil with salt, and turn the area into a desert
可知灌溉含盐的水．且没有引流．也会导致土地沙漠化。因此，正确答案是C。

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单选题

A．Teach their young how to swim.
B．Mate and lay eggs.
C．Hide from predators.
D．Eat different kinds of fish.

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单选题

A．Its geography is similar to Brazil's.
B．Their instinct leads them to the place they were hatched.
C．There are other species of turtles located there.
D．Its climate is milder than Brazil' s.

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单选题

A．To discover how long their ancestors lived.
B．To analyze how their appearance has evolved.
C．To find out how a disease has spread
D．To determine how closely groups of turtles are related.

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