It is important to maintain a constant temperature inside the greenhouse. The un

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问题 It is important to maintain a constant temperature inside the greenhouse. The underlined part means _____.

选项 A、prevent
B、regain
C、retain
D、repel

答案 C

解析考查动词词义辨析。maintain在此处的意思为“保持”，四个选项中，意思与之一致的是retain“保持，保留”。A. prevent“阻止”；B．regain“恢复”；D．repel“击退”。

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A.claimB.advancedC.challengeD.butE.constantlyF.