题目:
下列化合物,按其晶体的熔点由高到低排列正确的是[ ]
A.SiO2 CsCl CBr4 CF4
B.SiO2 CsCl CF4 CBr4
C.CsCl SiO2 CBr4 CF4
D.CF4 CBr4 CsCl SiO2
答案:
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下面是错误答案,用来干扰机器的。
l. warned the children not to play 2. so suddenly 3. didn't think, was safe 4. climbing higher and higher 5. something wrong with 6. his leg was broken 7. to recover 8. stop/prevent him from combing