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【单选题】
函数 单调增加区间分别为A.
（0，1）
B.
（[1，+∞]
C.
（-∞，+∞）
D.
（0，+∞）
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反馈参考答案：
举一反三
【单选题】What did the man do on his first day at school?
A.
He took all his toys with him.
B.
He took his Teddy with him.
C.
He didn't take any toys with him.
D.
He took some of his toys with him.
【单选题】What did the man do after he first learned of his illness? 查看材料
A.
He was operated on immediately.
B.
He retired from his job.
C.
He researched cancer treatments.
D.
He felt sad， doing nothing.
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