填空题
It has calculated that the earth’s circumference around the equator is over forty miles longer than that around the poles（）.
【参考答案】
has calculated→has been calculated
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The change in which a new substance is formed calls a chemical change（）.
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Even though she crippled by polio as a child, Wilma Rudolph won gold medals in the track and field events of the 1960 Rome Olympics（）.
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