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【简答题】
变形后产生的纤维组织使金属性能产生________。
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反馈参考答案：
举一反三
【单选题】It is implied in the passage that ______ in studying mathematics.
A.
in every country 'mathematic gene' plays a decisive role
B.
in every country 'mathematic gene' does not play a decisive role
C.
in America 'mathematic gene' plays a decisive role
D.
in countries other than the U. S. 'mathematic gene' plays a decisive role
【简答题】Every country has its own historic background.
【单选题】Earth Hour takes place in ________. D. every country
A.
March
B.
darkness
C.
landmark buildings alone
D.
every country
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