20. Bromyrite crystals (have) a diamond-like luster and are usually (colorless), but they (dard) to brown when (exposed) to light.
key: c, 是否c拼写有误?
21. Ice is less (denser) (than) the liquid ( from which) (it) is formed.
key: a,是否应改为dense原型.
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20,选C的理由是其他三个都对,至于这个词,不知道是什么
21,改dense
C的这个词不认识,再查一下资料,怀疑是时态问题,或是固定短语;
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