—What do you think we can do for our aged parents？

—You　_____do anything except that you visit them as often as possible.

A. don’t have to  B. oughtn’t to  C. mustn’t  D. shouldn’t

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----What do you know the _____ of are the pig influenza in humans?

   ---- usually similar to regular human seasonal influenza .

   A. symptoms          B.sympathy           C.symbol            D.symptom

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