第一節(jié)　 單項(xiàng)填空(共15 小題， 每小題1分， 滿分15分)

21 He spends all his spare time on physics , and he __________ the subject.

　 A .is crazy of　 　　 B .is crazy about　　　 　 C.is concerned about 　　　　　　 　D.is concerned for

22 Although I often send e-mails to Tom , I have never seen him 　_________ .

　 A.face to face 　 　B.on purpose　 　　　 　C.at the moment 　　　　 　D.hand in hand

23 She was angry at first but we managed to ________ her ________ 　.

　 A.calm ; down 　　　　　 B.add ;up　 　　　 C.try ; out　 　　　　　　　 D.throw ; away

24 -- You went to the US last month, didn’t you?

　　-- Yes .That was he first time that I 　_________ there .

A.had been　 　　　　　 B.had gone 　　　　　　 　C.went　　　　　　 　 D.have　 been

25 --My sister is very upset today .

　 --It’s your fault. . You ___________the bad news to her yesterday.

　 A.should tell　 　　　　 B.should have told　 　　　　　　 C. shouldn’t have told　 　　　 　　　 D.must tell

26 In the office I smiled at her but she just _________ me .

　 A.cheated　　　 　　　　　　 　B.ignored　 　　　　　　　 C.trusted　 　　　　 D.forgot

27 It was because of bad weather _________ the football match had to be put off.

　 A .so 　　　　　　　 　B.so that 　　　　　 　C.why　 　　　　　　　　 D.that

28 Li Min’s parents thought he was at school , but 　______he was in a cinema seeing a new film .

　 A.actually 　　　　　　 　B.of course 　　　　　 　C.however 　　　　　　　　　　 D.surely

29 As my teacher hadn’t changed a lot , I _________ 　him at once.

A.realized　 　　 　B.knew　 　　　　　　　　 C.remembered　　 　　　　 D.recognized

30 Most Irish people go to __________ church on Sundays and ________ church plays an important ________ in people ‘s lives.

　 A.the ; the ; part　 　　　 B. / ; the ; role　 　　　　 　C. / ; / ;part　 　 　D. the ; / ; role

31 We ‘re going to do some shopping . Will you _________ us?

　 A.take part in 　　　　　　 　B.join in 　　　　　 　C.join　 　　　　　 　D.take

32 --I missed the first part of the film . It was really a pity .

　 --You 　_________ home half an hour earlier .

　 A.should have left 　　　　　　 　B.must have left　 C.should leave 　D.must leave

33 The nurse told the children that the sun 　_________in the east .

　 A .risen　 　　　　　　　 　B .rose　　　　　　　 　 　 　C. rises　　 　　　　 D .rising

34 People in Britain speak the same language 　__________ Americans do.

　 A .which　 　　　　　　　　 B .what 　　　 　　　　　　 　C .like 　　　　　　　 　D. as

35 I don’t like 　__________ you speak to her..

　 A .the way　　 　　　 B .the way in that　　 　　 C. the way which　 　D.the way of which　

22、(14分)已知函數(shù)f(x)=x³+3ax-1,aR

(1)若函數(shù)y=f(x)的圖象在x=1處的切線與直線y=6x+6平行，求實(shí)數(shù)a的值。

(2)設(shè)函數(shù)g(x)=f^/(x)-6，對滿足-1≤a≤1的一切a的值，都有g(shù)(x) <0恒成立，求實(shí)數(shù)x的取值范圍。

(3)當(dāng)a≤0時(shí)，請問：是否在整數(shù)a的值，使方程f(x)=15有且只有一個(gè)實(shí)根？若存在，求出整數(shù)a的值，否則，說明理由。

21、(12分)某化工廠引進(jìn)一條選進(jìn)生產(chǎn)線生產(chǎn)某化工產(chǎn)品，其生產(chǎn)的總成本y(萬元)與年產(chǎn)量x(噸)之間的函數(shù)關(guān)系式可以近似地表示為y=-48x+8000，已知此生產(chǎn)線產(chǎn)量最大為210噸。

(1)求年產(chǎn)量為多少時(shí)，生產(chǎn)每噸產(chǎn)品的平均成本最低，并求最低成本。

(2)若每噸產(chǎn)品平均出廠價(jià)為40萬元，那么當(dāng)年產(chǎn)量為多少噸時(shí)，可以獲得最大利潤？最大利潤是多少？

20、(12分)在銳角△ABC中，a,b.c分別為角A，B，C所對的邊且a=2csinA

(1)確定角C的大小

(2)若c=且△ABC的面積為，求a+b的值