0  333380  333388  333394  333398  333404  333406  333410  333416  333418  333424  333430  333434  333436  333440  333446  333448  333454  333458  333460  333464  333466  333470  333472  333474  333475  333476  333478  333479  333480  333482  333484  333488  333490  333494  333496  333500  333506  333508  333514  333518  333520  333524  333530  333536  333538  333544  333548  333550  333556  333560  333566  333574  447090 

27.Sales of CDs have greatly increased since the early 1990s, when people    to enjoy the advantages of this new technology.

A.begin             B.began            C.have begun       D.had begun

试题详情

26.I accept that he is not perfect,     I do actually like the person.

A.while             B.since             C.before            D.unless

试题详情

25.Why didn’t you tell me there was no meeting today? I    all the way here    the heavy snow.

A.needn’t have driven; through            B.can’t have driven; across

C.mustn’t have driven; through            D.shouldn’t have driven; cross

试题详情

24.For quite     students, their teacher’s advice is more important than    of their parents.

A.few; one          B.a few; that        C.a little; some      D.a lot; many

试题详情

23.He is neither      European, nor    American. He is from    Australia.

A.a; an; 不填       B.a; an; the         C.a; a; 不填        D.an; an; 不填

试题详情

22.The music he is playing sounds     .

A.nicely             B.sweetly           C.pleasantly        D.lively

试题详情

第一节:语法和词汇知识(共15小题,每小题1分,满分15分)

从A、B、C、D四个选项中,选出可以填入空白处的最佳选项。

21.--- May I take your order now?

---      .

A.No, I’m in trouble now                  B.Yes, we obey orders

C.Yes, I’d like a dish of chicken             D.No, I don’t have a choice of meat

试题详情

25.(1)当t=2时,(如图1),Q与D重合,P恰好是AB的中点,

则PQ=CP

(2)当2<t≤4时,(如图2)Q在CD上,过Q作于E,AE=QD=2t-4,AP=t.PE=t-(2t-4)=4-t.PB=4-t,PB=PE,BC=EQPC=PQ仍然成立

(3)当0≤t≤2时,(如图3),

 

当2<t≤4时,QD=2t-4,CQ=4-(2t-4)=8-2t.过P作,则PF=4.

  又开口向下对称轴为t=3,

∴0≤t≤2时,S随t增大而增大,当t=2时,S取得最大值为8.又  ∵S=-4t+16,

2<t≤4 ∴2<≤4≥0,∴S的值不可能超过正方形面积的一半8.

试题详情


同步练习册答案