1.A transformer is a device that can convert one ac voltage to another ac voltage through the action of _____.
A.an electric circuit
B.a magnetic field
C.an electric field
D.a coupling circuit
2.The hydropower is well suited for switching according to _____ command to meet changing power needs.
3.These are all (_______) demands.
4.Lenin stressed that it is precisely the people who (_______) history.
5.________ a concert next Saturday?
A.There will be
B.Will there be
C.There can be
6.—Are you sure that you’ve met him before? — ___I’m mistaken.
7.When John came in, she (_______) her talk with Linda and talked to him.
8.An expansion slot is a long, narrow socket on the motherboard into which you can plug _____.
A.an expansion card
C.a network card
D.a sound card
9.A computer’s microprocessor only understands _____ in binary form.
10.They thought the program was (_______) investigating．
11.These heavy walls expressed man's fear of the outer world and his need to find (_______) .
12.Be sure to (_______) your work at the end of the exam.
D.catch sight of
13.If they come, we ________ a meeting.
14.The notebook computers use _____ as standard display equipment.
15.The generator voltages are usually stepped up to the transmission voltage level by _____.
16.We go to the cinema (_______) a week.
17.The system’s characteristic equation can be used to determine _____ of a linear time-invariant system.
B.magnitude of the steady-state error
18.Oh, sorry to bother you. ----- (_______) .
B.No, you can't
D.Oh, I don't know
19.The objective of the optimal economic operation of power systems is _____.
A.to minimize the total production cost
B.to maintain frequency constant
C.to maintain voltages constant
D.to ensure balance between generation and load
20.(_______) finishing his homework, he had to stay home at the weekend.
D.Having not being
21.——Excuse me, but there’s no smoking on this flight .——Oh , I ___that . Sorry, I won’t do it again.
22.—Don’t you think hard work is what makes people succeed?— ___.
A.I couldn’t agree more
B.I hope so
C.I’ve got it
D.Wish you success
23.Some schools teach but fail to (_______) their students.
24.——I’m sorry I stepped outside for a break . I was very tired.——There’s no ___for this while you are on duty .
25.___, and we’ll know the results of the contest.
A.Another 3 days
B.Three days later
C.After 3 days
D.In three days
26.The proposal seems quite good, but I can’t easily (_______) without all the facts.
27.Although he had looked through all the reference material on the subject, he still found it hard to understand this point and her explanation only (_______)to his confusion.
28.He was then the only ___among the___there.
A.person asleep, people present
B.asleep person, present people
C.person asleep, present people
D.asleep person, people present
29.The teacher advised Joe to___before deciding to quit school.
30.So far is known, the original manuscripts of Shakespeare’s plays are no longer (_______) .
C.all in all
31.Within industries, companies are always trying to develop products that are one step better than___ of other companies.
32.The DC-DC converts _____ input to _____ output.
A.direct current, alternating current
B.direct current, direct current
C.alternating current, alternating current
D.alternating current, alternating current
33.The electric machine that operates at speeds above synchronous speed works in _____ region.
34.The wide application of operational amplifiers lies in advantage of using _____.
A.positive feedback networks
B.large open-circuit gain
C.negative feedback networks
D.small output impedance
35.In the root-locus method the actual time response of a system can be obtained by means of _____.
A.the inverse Fourier transform
B.the inverse Laplace transform
C.the Fourier transform
D.the Laplace transform
36.I believe we’ve met somewhere before. --- No, (_______) .
A.it isn’t the same
B.it can’t be right
C.I don’t think so
D.I’d rather not
37.The advertisement said that an expanding company wished to (_______) a secretary at their head office.
38.The aim of our training is to teach the students to have the ability of tackling problems (_______) .
A.of their own
B.on their own
C.to their own
D.for their own
39.My passport (_______) last month, so I will have to get a new one.
40.After stopping for a few minutes, the bus moved (_______) to its next stop.
41.We have come to a critical moment. You must take immediate (_______) .
42.Her eyes were filled (_______) tears.
43.“Have you seen Lao Wu recently?” “It looks (_______) he would return home tomorrow.”
44.Could I use your dictionary for a moment? -----(_______).
B.It doesn't mattter
C.By all means
D.I have no idea
46.All the characteristics that distinguish birds (_______) other animals can be traced to prehistoric times.
47.I would die (_______) marry him!" she screamed.
48.— My best friend’s in a bad mood.— How about ____ her some flowers?
49.I think English is as ____ as math.