单选题：The heat released by burning oil and coal is the direct caus

题目内容：

The heat released by burning oil and coal is the direct cause of global warming. A．Right
B．Wrong
C．Not mentioned

参考答案：

答案解析：

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The phrase "take an optimistic line on" in the second paragraph probably means

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阅读材料，回答题。High Blood PressureThere is evidence that the usual variety of high blo

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