题目内容

Only about one tenth of the cells in your body are ...

A. alive.
B. really you.
C. bacteria.

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Bacteria are mostly ...

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

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.