The defense system will ______ if no proper identifying signal is given.

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问题 The defense system will ______ if no proper identifying signal is given.

选项 A、maintain
B、compact
C、condense
D、activate

答案D

解析此题考查动词词义。A项maintain“保持；维持”为一个及物动词，因为在本句中无宾语，句意不完整，因此应首先排除。B项com pact“变得坚实”和C项condense“压缩；凝聚”都不合题意。D项 activate在此作不及物动词，意为“激活；开始起动”，符合题意。

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专业英语四级

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The defense system will ______ if no proper identifying signal is given.

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PassageFour(1)Faithschoolsandacademiesshouldbestrippedoftheirpowertochoosepupils,accordingtoresearchthat

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