单项选择题

What did Dr. Goller mean when he said "Nobody is here today"

A．He did not want to teach girl students.
B．No students came to his class.
C．Nobody was interested in his class.
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单项选择题
What is the main idea of the first two paragraphs
A．Green plants are very important to dry places.
B．Land is becoming desert faster than scientists can change it back into good land.
C．If scientists can bring water to desert, people can live and grow food there.
单项选择题
Desert ______.
A．get very little rain
B．never have any plants or animals in them
C．can all be turned into good land before long
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