若8个字（字长32位）组成的位示图管理内存，假定用户归还一个块号为100的内存块时，它对应位示图的位置为（）。（假定字号、位号、块号均从1开始算起，而不是从0开始。）
A. 字号为3，位号为5
B. 字号为4，位号为4
C. 字号为3，位号为4
D. 字号为4，位号为5
I must leave now.(), if you want any help, just call me up.
A. Incidentally
B. Accidentally
C. Occasionally
D. Subsequently
The illness from which my grandma is suffering has now been()as diabetes.
A. deduced
B. determined
C. diagnosed
D. discovered
I wrote back to Charles()I received his letter.
A. when immediately
B. soon
C. immediately
D. suddenly
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