It can be inferred that proper amounts of iodine, fluoride and calcium can_____.
（A）benefit people’s physical health
（B） influence the quality of water supply
（C） help provide breeding places for pests.
（D） strengthen a person’s character
参考答案
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- 1We preferred to put the meeting off rather than __ it without adequate preparation.
- 2— Hello, could I speak to Don please — ___________
- 3Friends you make at college are likely to remain friends ___________.
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