--What _____ useful book! --Yes. I found _____ difficult for me to read.
A. an;it
B. a;it’s
C. an;it was
D. a;it
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---Who’s that girl over there? ---Julia,she is a student of ____.
A. my fathers’
B. my father
C. my fathers
D. my father’s
--Have you read ________? ---Yes, I have.
A.today newspaper
B. today’s newspaper
C. Today’s newspaper
D. newspaper of today
--My seat is between ______.we often help each other with our lessons.
A.Tim and Jack
B. Tim and Jack’s
C. Tim’s and Jack’s
D. Tim’s and Jack
某系统中有3个并发进程，都需要同类资源4个，请问该系统中不会发生死锁的最少资源数是（）。
A. 9
B. 10
C. 11
D. 12
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