1) L51-1.It's _difficult for foreigners to learn Chinese. a) a. notoriously b) b. assiduously c) c. famous 2) 2.Scientists have _ that oil resources will be exhausted in several decades. a) a. told b) b. predicted c) c. told before 3) 3.Before we had computers, many office workers had to do dull and_work every day. a) a. repeating b) b. repetition c) c. repetitive 4) 4.Four doctors were invited to _ the patient's illness. a) a. explore b) b. find c) c. diagnose 5) 5.She_ that he would marry the girl sooner or later. a) a. told b) b. recurred c) c. predicted 6) 6.The introduction of computers_countless workers and accountants of dull work. a) a. diminished b) b. waned c) c. relieved 7) 7.Such early computers as the Altair were very_, but they pointed the way to the more advanced home computers of the future. a) a. original b) b. primitive c) c. simplified  8) 8.I am wondering who will_your job when you leave. a) a. take in b) b. take over c) c. take up 9) 9.This particular kind of butterfly was already extinct _the middle of the 19th century. a) a. as soon as b) b. as long ago as c) c. long ago 10) 10.He has to resign from his present position. He has no other_. a) a. possible b) b. probable c) c. alternative 11) 11.The Internet is becoming a convenient way to _ information on every known subject, a) a. attain b) b. detain c) c. obtain 12) L51-12.It was remarkable for a man in the 1960s to_a time when computers would be small enough to hold in the hand. a) a. tell b) b. foresee c) c. warn 13) L51-1. _ the end of the 20th century, computers had become as common as TV sets. a) By b) In c) Of d) To e) With 14) 2. Primitive as the early computers were, they pointed the way_the future. a) by b) in c) of d) to e) with 15) 3. The use of robots relieved workers_some very dangerous jobs. a) by b) in c) of d) to e) with 16) 4. Computers are capable _ providing information on all subjects. a) by b) in c) of d) to e) with 17) 5. Nowadays we can communicate _ people over long distances in a variety of ways.  a) by b) in c) of d) to e) with 18) 6. All the machines_use in this factory are out of date. a) by b) in c) of d) to e) with 19) L51-7. We got lost when we tried to return _ an alternative route. a) by b) in c) of d) to e) with

L51-NCE03

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