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4. ----Who ____ it be that hasn’t handed in his composition?

----It ____ be Robinson. He ____ it in yesterday.

A. can, will, should hand           B. can, must, should have handed

C. may, may, can’t have handed        D. will, can, could have handed

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3. Only ticket holders will be ____ the stadium.

A. admitted into     B. allowed in       C. admitted entering  D. allowed entering

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2. I found her nice and honest ____ I saw her.

A. for the first time   B. the first time     C. on the first time   D. at first

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1. He came here by ____way of London. In ____ way his health is much improved, but he is still not really well.

A. a, a           B. /, a            C. the, the         D. a, the

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17.已求函数的单调区间.

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16.如图,A,B,C为函数的图象

  上的三点,它们的横坐标分别是t, t+2, t+4(t1).

(1)设ABC的面积为S 求S=f (t)  ;

(2)判断函数S=f (t)的单调性;

(3) 求S=f (t)的最大值.

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15.现有某种细胞100个,其中有占总数的细胞每小时分裂一次,即由1个细胞分裂成2个细胞,按这种规律发展下去,经过多少小时,细胞总数可以超过个?(参考数据:).

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14.设函数.

(1)确定函数f (x)的定义域;

(2)判断函数f (x)的奇偶性;

(3)证明函数f (x)在其定义域上是单调增函数;

(4)求函数f(x)的反函数.

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13.已知函数.

(1)求函数f (x)的定义域;(2)求函数f (x)的值域.

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12.函数y= 的单调递增区间是       .

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