题目内容

Animals need bacteria to ...

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

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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.

Mites are very small creatures that are about ...

A. 3 millimetres long.
B. a third of a millimetre long.
C. 0.03 millimetres long.