问题
单项选择题
Some physicists have proposed that sunspots and solar wind have negligible effects on the earth's weather.
A．undetermined
B．insignificant
C．unusual
D．indisputable
答案
参考答案：B
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Some physicists have proposed that sunspots and solar wind have negligible effects on the earth's weather.
A．undetermined
B．insignificant
C．unusual
D．indisputable
参考答案：B