赞题库-背景图

单项选择题

Which of the following is the smallest

A．A pinhead.
B．A rounded bacterium.
C．A microscope.
D．A rod-shaped bacterium.

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热门试题

单项选择题In a good bookshop ______.

A．nobody takes any notice of you
B．the assistant greets you in a friendly way
C．you can always obtain the books you need
D．you feel that you are in a music shop

单项选择题In paragraph 3, sentence 2, the author compares water to molasses in order to introduce which of the following topics

A．The bacterial content of different liquids.
B．What happens when bacteria are added to molasses.
C．The molecular structures of different chemicals.
D．How difficult it is for bacteria to move through water.