已知函数f（x）=x2+1，那么f（a+1）的值为

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已知函数f（x）=x²+1，那么f（a+1）的值为（）

A：a²+a+2

B：a²+1

C：a²+2a+2

D：a²+2a+1

上一题下一题 0.0难度选择题更新时间:2015-10-27 04:28:13

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C

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选择方框中合适的句子还原到短文中。

①____. But how much do you know about headaches? What may cause(引起) them? And what should we do if we have a headache? When should we go to see a doctor?

②____, but it may show that something in our body is wrong. We may have more than one headache each month.

③____. We may get a headache when we work too hard. We may get a headache when we don't get enough sleep. We may get a headache when we exercise on an empty stomach.

What should we do if we have a headache?

④____. We should have a good sleep. We shouldn't take too much exercise if we are hungry.

⑤____, we need to see a doctor.

A. Usually a fever or some other illnesses may cause headaches

B. We should lie down and rest

C. A headache is not a disease(疾病)

D. Everyone gets headaches sometimes

E. If we have headaches often

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