1 . ________ a good living habits,________ you will stay healthy.
A.To have; or | B.Have;and | C.Having;then | D.Had;but |
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2 . One might think Fleming discovered penicillin by accident, ________ actually this is far from the truth.(用适当的词填空)
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3 . Some people never seem to put on weight________ others are always on a diet.
A.while | B.or | C.since | D.for |
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