问题
判断题
MDA指令执行过程中，系统状态由“空闲”变为“运行”；执行结束后，则由“运行”变为“空闲”。
答案
参考答案：对
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MDA指令执行过程中，系统状态由“空闲”变为“运行”；执行结束后，则由“运行”变为“空闲”。
参考答案：对
Passage Four
Which of the following statements can be inferred from the passage
A．An investor of trading stocks only cares about the fixed assets of companies.
B．A buyer of investing stocks is always concerned about the performance of companies.
C．Most people keep their investing stocks for a longer period of time.
D．All people buy trading stocks and investing stock at the same time.