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
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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
A.anywhere B.here C.carefulD.compare
A. anywhere
B. here
C. careful
D. compare
Many people wrote to Johnson to find out，_________．
A. what kind of whisky he had
B. how to live longer
C. how to become wealthy
D. in which part of the neck to have an injection
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