21It would be very difficult for a library to be without dictionaries and encyclopedea; such reference books are _____ .
A.unavoidable
B.inevitable
C.indispensible
D.fundamental
开始考试练习点击查看答案22To remain competitive in the international market place, U.S. industries have recognized that they must attract the brightest, most _____ young people available.
A.committed
B.dedicated
C.determined
D.contributed
开始考试练习点击查看答案23However dull work may be, it becomes bearable if it is a means of building up _____ , whether in the world at large or only in one's own circle.
A.admiration
B.vanity
C.honour
D.reputation
开始考试练习点击查看答案24Job applicants often developed the suspicion that _____ are set aside for friends and relatives and that advertisements are only put out to avoid this accusation.
A.positions
B.vacancies
C.occupations
D.posts
开始考试练习点击查看答案25But people who read hour after hour or work where the eyes are kept steadily at one focus soon may come to need glasses to correct their _____ .
A.vision
B.view
C.visibility
D.perception
开始考试练习点击查看答案26Anyone who has ridden on a railroad train knows how rapidly another train flashes by when it is travelling in the opposite direction and _____ how it may look almost motionless when it is moving in the same direction.
A.meanwhile
B.accordingly
C.likewise
D.conversely
开始考试练习点击查看答案27Manufacturing is Canada's most important economic activity. It _____ more than half the value of all Canadian production.
A.accounts for
B.amounts to
C.takes up
D.turns out
开始考试练习点击查看答案28Tests reveal that mother's heartbeat can have a calming effect on the infant. Those who were _____ the heartbeat recording fell asleep in half the time it took for those who were not.
A.left to
B.exposed to
C.faced with
D.trusted with
开始考试练习点击查看答案29Picture what happens when a father _____ his child into the air. The child will probably laugh, enjoying the game.
A.casts
B.pitches
C.tosses
D.elevates
开始考试练习点击查看答案30Once a lighthouse is built, no ship of any nationality can be effectively _____ from the utilization of the lighthouse for navigational purposes.
A.isolated
B.dismissed
C.distracted
D.excluded
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