单项选择题

A．Greenhouse gases.
B．Global warming.
C．Change of agricultural zones.
D．Change of climates.
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单项选择题
A．He was the son of an American.B．He was the son of the teacher.C．He was the son of a Japanese businessman.D．He was the son of a Japanese teacher.
A．He was the son of an American.
B．He was the son of the teacher.
C．He was the son of a Japanese businessman.
D．He was the son of a Japanese teacher.
单项选择题
A．I should adopt many measures.B．I should be careful.C．The risk to me was almost nonexistent.D．I could not visit my friend because it was dangerous.
A．I should adopt many measures.
B．I should be careful.
C．The risk to me was almost nonexistent.
D．I could not visit my friend because it was dangerous.
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