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【单选题】
下面关于进程的叙述中,正确的是( )。A.
进程获得CPU运行是通过调度得到的
B.
优先级是进程调度的重要依据，一旦确定就不能改变
C.
单CPU的系统中，任意时刻一个进程处于运行状态
D.
进程申请CPU得不到满足时，其状态变为阻塞
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【单选题】It is not who rules us ______ is important, but how he rules us.
A.
what
B.
that
C.
/
D.
which
【简答题】Who will do more harm to the environment, the developing countries or the developed countries?
【单选题】听力原文：The new rules call for blood centres to develop more ways to make sure the country's blood supply. According to the speaker,
A.
there are more ways to ensure blood supply.
B.
more ways should be developed.
C.
new rules should be developed.
D.
more blood supply should be called for.
【单选题】From 1949 to 1972, the number of scientists who moved into the USA from various countries in the world reached ()
A.
200 000
B.
300 000
C.
400 000
D.
500 000
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