【題目】______ you fully understand the instructions of the experiment, your life won’t be secured.

A. Unless B. If C. Once D. When

【答案】A

【解析】考查連詞辨析。A. Unless除非；B. If如果；C. Once一旦；D. When當(dāng)……時候。句意：除非你完全理解實驗的指導(dǎo)，否則你的生命將無法得到保障。表達的是“除非”的意思，故選A。

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