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【单选题】
对笼形化合物的微结晶描述有误的是?A.
与冰晶结构相似。
B.
当形成较大的晶体时，原来的多面体结构会逐渐变成四面体结构。
C.
在 0℃以上和适当压力下仍能保持稳定的晶体结构。
D.
天然存在的该结构晶体，对蛋白质等生物大分子的、稳定有重要作用。
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举一反三
【简答题】I’m afraid I already have an ___1____ then . Do you think we could meet earlier?
【单选题】With the old man _____ the way, we had no trouble in finding that the mysterious cave.
A.
leading
B.
led
C.
lead
D.
to be led
【简答题】Replying to an invitation A: Would you like to join us for dinner tonight? B: That’s _______________ kind _______________ _______________ , but I’m afraid I already have a dinner engagement.
【单选题】Tom _______ the old man by the arm, they crossed the street together slowly.
A.
leading
B.
led
C.
having led
D.
having been led
【单选题】With the old man______the way, we had no trouble in finding that mysterious castal.
A.
leading
B.
1ed
C.
lead
D.
to be led
【简答题】中医学中“证”的概念是（ ）
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