I don’t understand such a silly question in class yesterday.A. why did John ask B. why John askedC. why is John asking D. why John asks 题目和参考答案——青夏教育精英家教网—

题目内容

I don’t understand ______ such a silly question in class yesterday.

A. why did John ask B. why John asked

C. why is John asking D. why John asks

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Cellphones help us easily find people anywhere at any time. However, using cellphones too often may cause cancer. It’s reported that people who used a cellphone for ten years or more were more likely to get brain cancer.

The suggestions below may help you reduce the risk(风险) of cancer:

When using your cellphone, try to keep it away from your body as much as possible. Don’t put it under your pillow(枕头) or on a bedside table when you sleep.

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Try to keep your conversations short. If you need to talk longer, use an ordinary phone instead.

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Do not use your cellphone when the signal is weak or when moving at a high speed, for example in a car or train. At high speeds your phone is trying to pick up signals, and this increases the radiation it gives out.

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4._________________________________________________________________

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