The main unit _________  all the computer’s electronics.
A．containsB．shows
C．usesD．helps
A

試題分析：句意：這個主單元包括所有的計(jì)算機(jī)。A. contains包括； B. shows 出示； C. uses 使用； D. helps幫助；根據(jù)句意，故選A。
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