题目内容

Food may cause forty percent of cancer in the world.

A. Right
B. Wrong
C. Not mentioned

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According to the passage, what is NOT an alternative energy source? ______

A. Fuel cell.
B. Nuclear power.
C. Petrol.
D. Sun energy.

Glaciers terminate where the rate of ice loss is equivalent to the forward advance of the

A. stop
B. turn
C. crack
D. rotate

Nitrates are usually used for keeping the smell of food.

A. Right
B. Wrong
C. Not mentioned

Tanning by the sun takes place because sunlight stimulates the skin to produce the pigment

A. burning
B. roasting
C. browning
D. scorching

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