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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