難度：★    考點：連詞

　　1. We should care more about our health _______ good health is the first step towards success.

　　A.    so  B. because  C. but  D. if

　　2. -Why didn't you try your best to get on the subway?

　　-I tried to, but it started moving_________I could get on it.

　　A. before       B. after       C. since           D. if

　　3. Tcny is only four years old, _______he draws very well.

　　A- but B, so C. or D. and

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