单项选择题

Diffusion is the spontaneous spreading of matter caused by the random movement of molecules.()

A. pattern1ess
B. whirling
C. constant
D. rampant

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单项选择题
In 1845 Sarah Mather invented a submarine telescope that could be used to locate and study underwater objects.()

A. illuminate
B. raise
C. find
D. examine
单项选择题
In order to improve our standard of living, we have to accelerate production().

A. speed up
B. decrease
C. stop
D. control
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