题目内容

A.carefulB.slowC.fastD.appropriate

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

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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

A.eventB.activitiesC.sportD.play

A. event
B. activities
C. sport
D. play

If law and order__________not preserved，people will notBe able to live a secure life．

A. are
B. were
C. is
D. was