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

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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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