单项选择题

The expression" a variety of tests" (Line 1, Para. 3) means ______.

A．a large number of different tests
B．a large number of easy tests
C．a large number of similar tests
D．a large number of difficult tests
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单项选择题
To judge a child's standard, his marks in a test must be compared with marks gained by ______.
A．others of the same age
B．older children
C．younger children
D．adults
单项选择题
It is easy for many kinds of insects to live in the desert because ______.
A．They only need a little food to survive
B．they are not afraid of the heat
C．They are too small to be attacked by other animals
D．they have a skin which is against water
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