题目内容
（请给出正确答案）
She says we should save water when ______.
A．washing cars
B．cleaning clothes
C．taking a bath
D．washing fruits and vegetables
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A、A. It is an exact science.
B、B. It is the best tool people can rely on.
C、C. It is a useful tool for examining the relative importance of each risk.
D、D. It should be referred to when people are supposed to make decisions under pressure.
A.toward the inside of the bend
B.toward the outside of the bend
C.toward the center of the river just before the bend, then change course for the river’s venter after the bend
D.in the river’s center
A、It is three inches in thickness.
B、It is in the shape of a circle.
C、It covers an area of 850,000 square kilometers.
D、It is as delicate as silk.
A．the presence of nitrogen in the blood
B．the muscles of the thoracic cavity
C．the flow of blood
D．the moisture in the air sac linings
A．They brighten up railway stations and newspapers.
B．They lower the cost of any new products.
C．They make it easy to buy goods and to find jobs.
D．They are the source of certain company’s revenue.
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