答案:C
解析:
Choice (C) is correct. It makes sense to say that when his factory exploded, Nobel discovered how "volatile," or unpredictable, nitroglycerin could be; in fact, it was "liable" to, or prone to, detonate unexpectedly.
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答案:C
解析:
Choice (C) is correct. It makes sense to say that when his factory exploded, Nobel discovered how "volatile," or unpredictable, nitroglycerin could be; in fact, it was "liable" to, or prone to, detonate unexpectedly.