题目内容

答案为：

A. Therefore
B. Instead
C. Indeed
D. After all

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Mary saw her son_________the piano when she came to the room．

A. playing
B. play
C. played
D. to Cay

A.carefulB.slowC.fastD.appropriate

A. careful
B. slow
C. fast
D. appropriate

A.muchB.oftenC.notD.very

A. much
B. often
C. not
D. very

如果抛物线方程y2=-16x，那么它的焦点到准线的距离等于（） (A)2 (B)4 (C)8 (D)16