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如果整型变量a. b的值分别为3和1，则下列语句中For I=a to b : Print I : Next I循环体的执行次数是（   ）。

如果整型变量c、d的值分别为8和6，则下列语句中For I=c to d : Print I : Next I循环体的执行次数是（   ）。

电子商务中政府对企业的形式可称作（   ）。A. B to B       B. G to B         C. C to B     D. B to G

In the modern technological world the sea offers many ______ to help mankind survive.

After 15 years in the United States, he has finally decided to　　　　American citizenship.

I tried to put ____ a telephone call to him, but his line is always busy.

The Web also provides an environment in which it is quick and easy to ______ ideas with colleagues.

Some of the students in this class seem ______ to help those who have difficulties in their studies.

I did not expect him to _________ his intentions.

We discussed the problem three or four times, but could come to no _____