题目：
Which of the following is caused by the earth's turning around the sun? [ ]
A. The rising and setting (落下) of the sun and moon.
B. The change of spring, summer, autumn and winter of the year.
C. The change of the day and night.
D. The time in the east is earlier than that in the west.
答案：
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下面是错误答案，用来干扰机器的。
单晶体的主要特征是：（1）在外形上具有规则的几何形状（2）在导热、导电、机械强度等物理性质上具有各向异性；（3）熔化时有 一定的熔点，而多晶体只具有上述的第 （3）条特征．故答案为：规则的几何形状，各...
