The main idea of this passage is__________.

The main idea of this passage is__________.A.that vicious and dangerous sports s

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Travelling at high speed means__________.

Travelling at high speed means__________.A.people's focus on the future B.a plea

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What does the author mainly want to tell?

What does the author mainly want to tell?A.All people will face death, and thus

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--Hurry up! There is little time left before the train leav

--Hurry up! There is little time left before the train leaves.--We __________

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下列关于电弧电压与电弧长关系的表述,正确的是(  )。

下列关于电弧电压与电弧长关系的表述,正确的是(  )。A.电弧长则电弧电压低,电弧短则电弧电压低 B.电弧长则电弧电压高,电弧短则电弧电压低 C.电弧长则电弧电

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