单项选择题

It can be inferred from the passage that ______.

A．it is bad to plant in rows in a dry place
B．it is better to raise animals on dry land than to make a farm
C．it is bad to make a farm in a dry place, but it is good to raise animals there
D．all lands that don't get very much rain are deserts

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单项选择题

Which of the following is NOT the reason why small green plants are very important to dry places

A．They keep the earth from becoming even drier.
B．They do not let wind blow the earth away.
C．They add color to the dry places.
D．They hold water.

单项选择题

American university students are usually under pressure of work because ______.

A．their academic performance will affect their future careers
B．they are heavily involved in student affairs
C．they have to observe university discipline
D．they want to run for positions of authority