题目内容

May this book_(help) to enhance the understanding and friendship between the two people.

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Down_(the burglar jump)from the tenth floor when the policeman pointed his pistol at him.

Seldom________(l make) my mistakes during my past five years of service here.

Hardlly_1_the bell2(ring)when the teacher came in.

已知 double a;使用scanf()函数输入一个数值给变量a,正确的函数调用是（）。

A. scanf("%ld",&a);
B. scanf("%d",&a);
C. scanf("%7.2f",&a);
D. scanf("%lf",&a);