---If a person is in danger,what does he or she usually say? --- ______.

单选题

---If a person is in danger,what does he or she usually say? --- ______.

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单选题

If _____properly, time is the money in the bank.

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单选题

If a person is bitten by some kind of animal，you________.

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单选题

An elderly person is more susceptible to _____________ if too much calcium is removed from the bones.

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材料题

rket is a concept. If you are growing tomatoes in your backyard for sale you are producing for the market. You might sell some to your neighbor and some to the local manager of the supermarket. But in either case, you are producing for the market. Your efforts are being directed by the market. If people stop buying tomatoes, you will stop producing them. If you take care of a sick person to earn money, you are producing for the market. If your father is a steel worker or a truck driver or a doct

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