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发表于 2017-8-6 21:55:55
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Part II Cloze Test (20 minutes, 10 points, 1 point each)
Directions: For each blank in the following passage, choose the best answer
from the choices given below. Mark your answer on the Answer Sheet by drawing
with a pencil a short bar across the corresponding letter in the brackets.
It is difficult to imagine what life would be like without memory. The
meanings of thousands of everyday perceptions, the bases __21__ the decisions we
make, and the roots of our habits and skills are to be __22__ in our past
experience, which are brought into the present __23__ memory.
Memory can be defined as the capacity to keep __24__ available for later
use. It includes not only "remembering" things like arithmetic or historical
facts, but also any change in the way an animal typically behaves. Memory is
__25__ when a rat gives up eating grain because he has sniffed something
suspicious in the grain pile. Memory is also involved when a six-year-ole child
learns to swing a baseball bat.
Memory __26__ not only in humans and animals but also in some physical
objects and machines. Computers, for example, contain devices for storing data
for later use. It is interesting to compare the memory-storage capacity of a
computer __27__ that of a human being. The instant-access memory of a large
computer may hold up to 100 000 "words"--ready for __28__ use. An average
American teenager probably recognizes the meanings of about 100 000 words of
English. However, this is but a fraction of the total __29__ of information
which the teenager has stored. Consider, for example, the number of facts and
places that the teenager can recognize on sight. The use of words is the basis
of the advanced problem-solving intelligence of human beings. A large part of a
person's memory is in terms of words and __30__ of words.
21. A. of B. to C. for D. on
22. A. keep B. found C. sought D. stored
23. A. by B. from C. with D. in
24. A. experiences B. bases C. observations D. information
25. A. called B. taken C. involved D. included
26. A. exists B. appears C. affects D. seems
27. A. to B. with C. against D. for
28. A. progressive B. instructive C. instant D. protective
29. A. deal B. number C. mount D. amount
30. A. combinations B. connections C. co-ordinations D. collections
Part III Reading Comprehension (60 minutes, 40 points)
Section A (30 points, 1.5 points each)
Directions: In this part there are four passages followed by questions or
unfinished statements, each with four suggested answers. Choose the one you
think is the best answer and mark your choice on the Answer Sheet.
Passage One
Questions 31-35 are based on the following passage:
All along the chain of biological evolution, the extinction of species
appears to have been a stage in the process of adapting genetic lineages to
changing environmental conditions. Although some catastrophic extinction
occurred naturally, producing total loss of a genetic line, such catastrophes
were comparatively rare. In modern times, however, human activities have altered
the fundamental nature of this process, resulting in nearly total genetic
losses.
It is not difficult to gain general agreement that man-induced increases in
the endangerment and extinction of wildlife-whether due to habitat alteration or
loss, pollution, insufficiently regulated hunting, or other factors -are
undesirable. It is, however, more difficult to obtain consensus when
consideration is given to the economic costs of correcting such trends,
including natural habitat preservation, regulation of pesticides and other toxic
substances, and wildlife and park management. Endangered species often are, in
effect, competitors with humans for habitat and other resources which also
provide other kinds of human uses and needs.
Measures needed to protect endangered species vary considerably in
difficulty and cost. Of the approximately 400 invertebrate species which at
present appear to be threatened, for example, about one-third could probably be
restored by such inexpensive means as modifying the boundaries of designated
natural areas, acquiring and protecting caves and other small areas which
contain the particular species, and additional management of parks and
refuges.
Another one-third of the endangered lower animal species are threatened
principally by water pollution and could be protected by improved control,
particularly of five southern rivers.
The remaining one-third of the 400 endangered shellfish species would be
considerably more difficult to protect. These are threatened by complex factors,
such as overcorrecting, channelization, highway and housing development, dams,
introduced species such as the Asian snail, dredging, quarry washing, poor
erosion control, and lowering of water tables.
The identification of threatened species and other significant wildlife
trends must precede any corrective measures, and our knowledge base for making
such identification is deficient in many respects. Our present lists of
threatened species and subspecies are known to be incomplete, except in those
geographical areas which contain habitats of species that have important
commercial or sports harvest value.
31. The passage is primarily concerned with discussing ________.
A. the catastrophes in history which caused the extinction of total
species
B. the ways to protect endangered species
C. the characteristics of threatened species
D. the significance of protecting threatened species
32. What's the author's attitude toward the view that it is catastrophes
that result in the total genetic losses?
A. Positive. B. Negative. C. Neutral. D. Enthusiastic.
33. With which if the following statements would the author most likely
agree?
A. People haven't realized the impact of human activities on the extinction
of wildlife.
B. It is difficult for people to agree to protect endangered species at
considerable economic cost.
C. Endangered species can provide human beings with a variety of useful
resources.
D. Similar measures can be taken to protect various endangered species.
34. The author mentions all of the following as threats to shellfish
species except ________.
A. highway and housing development
B. poor erosion control
C. overpopulation of shellfish
D. lowering of water tables
35. Given the information in the passage, which of the following is not
true of wildlife protection?
A. The identification of threatened species should come before
correction.
B. We have gained sufficient knowledge for making identification of
endangered species.
C. Our present lists of threatened species are incomplete.
D. Some geographical areas contain habitats of species that have important
commercial value.
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