需要支援,27.The problem is( )by pollution.A.caused B.because C.d

需要支援,27.The problem is( )by pollution.A.caused B.because C.due D.because of
Silk( )by Chinese for thousands of years now.
A.has usedB.has been usedC.was usedD.is used
2– We want to sit at the table near the window.– I'm sorry,but( )already.
A.it tookB.it takesC.it is being takenD.it has been taken
30.The beef I ate at the restaurant yesterday is delicious.I'd like to have it again even if it costs( ).
A.as twice muchB.much as twiceC.as much as
D.twice as much
32.– Where( )the recorder?I can't see it anywhere.– I( )it right here,but now it's gone.
A.did you put; have put
B.have you put; put
C.had you put; have put
D.were you putting; have put
33.Parliament didn't think the Prime Minister did enough in the improvement of fair employment,( )he was asked to write to Parliament for further explanation.
A.soB.thereforeC.sinceD.as
34.– Hello!Can I get a seat on the 8 pm flight to Detroit?– ( ).
A.Hello!International Airline
B.You'd better look up the schedule first
C.I'm sorry,but it's completely booked
D.I'm afraid you have to change
35.– Hey,Barbara.You look so pale.– ( ).
A.I'm just getting over the flu
B.It doesn't matter
C.You didn't sleep well last night
D.I'm sorry to hear that
36.By the end of this year,I( )enough money for a holiday.
A.will saveB.will be savingC.will have savedD.will be saved
37.– How long have you lived in London?– ( ).
A.I moved here from Paris B.My whole life
C.I've worked here for almost 10 years D.I've never traveled there
38.Given the high price,( )it's not surprising they didn't buy it.
A.and B.but C.不填 D.that
39.– I don't like the sports programs on Sundays.– ( ).
A.So do I B.Neither do I C.So am I D.Neither am I
40.He( )in the laboratory the whole morning.
A.has been working B.is working C.was working D.has worked
41.– How do I get to Cairo?– ( ).
A.I'm sorry.I can't understand
B.You could catch the 9:30 flight and change at Paris
C.I'm afraid you have missed the flight
D.I'm glad to show you the way
42.Although I am a good swimmer,I don't like( )in the sea.
A.swim B.swimming C.to be swimming D.to go to swim
43.– Jack,are you leaving now?It's 7:20.– ( ).
A.Yes,it's still early
B.No,thirty minutes is enough
C.Yes,the bag is not ready
D.No,I'll set off in 30 minutes
44.– Are you sure about that?– ( ).
A.You needn't worry about that
B.I like the idea
C.Oh,no.I'm afraid of that
D.Oh,yes.I'm absolutely positive
45.– Excuse me,does this bus go to the bookstore?– ( ).
A.The bus is so crowded
B.The bookstore is five blocks away
C.No.You'd better change at the next stop
D.You should wait in line
46.– Can I help you to get it down?– ( ).
A.No problem B.Yes.Let's get it C.Thanks.It's so nice of you D.It's no trouble at all

1、B 2.D
30、D 32A 33A 34D 35A 36C 37C 38C 39B 40A 41B 42B 43D 44D 45C 46C