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问题
单项选择题
中国历史上的准确年代计算，是从西周共和元年（公元前（）年）开始的，迄今不曾中断。
A.827
B.841
C.781
D.51
答案
参考答案：
B
填空题
Questions 14-18
·
Using the information in the text, complete each sentence 14-18, with a word or phrase from the list below.
·
For each sentence (14-18), mark one letter (A-G) on the Answer Sheet.
·
Do not mark any letter twice.
14. According to Dr. Score, lightning is caused by hail falling through ______.
15. The refrigerated rod served the same functions as ______.
16. Ice particles bouncing off hail falling through a cloud acquire ______.
17. In the paragraph four the word "duplicated" means ______.
18. According to S.E. Regnolds, there could be no lightning without ______.
A. copy
B. a positive charge
C. a negative charge
D. super cooled clouds
E. falling hail clouds
F. hail and super cooled clouds
G. moisture particles
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