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【单选题】
曲线的拐点是（）．A.
（-1，-e-1）
B.
（0，0）
C.
（-2，-2e-2）
D.
（2，2e2）
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【简答题】Word文本编辑中,文字的输入方式有插入和改写两种方式,要将插入方式转换为改写方式可按().A. A:Ctrl键 B. B:Delet键 C. C:Insert键 D. D:Shift键
【单选题】请问哪个选项可以更好地把句子补充完整？The World Wildlife Fund has declared that global warming, _____________________________, will create havoc among migratory birds by altering the environment in ways harmful to their...
A.
a phenomenon that most scientists agree is caused by human beings in buring fossil fuels
B.
a phenomenon that most scientists agree is caused by fossil fuels burned by human beings
C.
a phenomenon that most scientists agree is caused by human beings' buring of fossil fuels
D.
a phenomenon that is caused by fossil fuels burned by human beings
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