单项选择题

A．accumulation
B．development
C．knowledge
D．rate
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单项选择题
What’s the main topic of this passage
A．The tests of new airliner before its flying.
B．How to protect a new airliner
C．How to train a new pilot
D．What the airliner engineers should do
单项选择题
Which of the following is TRUE about plants
A．They have the power of locomotion.
B．They have a wider range of foods than animals.
C．They are very diverse in their external appearance.
D．They are less sensitive than animals.
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