题目内容

Bacteria are mostly ...

A. really helpful.
B. bad for humans.
C. neither good or bad.

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更多问题

Animals need bacteria to ...

A. fight diseases.
B. provide energy.
C. digest food.

You have ... cells in your body.

A. 7 million
B. 7 trillion
C. 7 octillion

Most of the atoms are ...

A. tiny cubes.
B. not used.
C. empty space.

You probably have mites in your ...

A. hair.
B. ears.
C. eyelashes.