英语四级模拟试题.
31．In order to focus on distant objects，the lens of the eye ____ ．
A）becomes more convex B）becomes more active
C）becomes more refractive D）flattens
32．The ligament，when not acted on by the contraction of the ciliary muscle，____ ．
A）maintains its pressure on the lens so that the lens remains flat
B）relaxes its pressure on the lens so that it remains convex
C）maintains its pressure on the lens so that the lens remains convex
D）relaxes its pressure on the lens so that it remains flat
33．Functionally，we may compare ____ ．
A）the lens of the camera with the lens of the eye
B）the lens of the camera with the ciliary muscle
C）the lens of the eye with the sliding of the back of the camera
D）the sliding of the back of the camera with the adaptability of the eyeball
34．Which of the following activities is most tiring for the lens of the eye？
A）Looking at a distant mountain．
B）Being a“sidewalk superintendent．
C）Watching squirrels being fed．
D）Reading a book．
35．The tone of this passage can best be described as ____ ．
A）professionally scientific B）argumentative
C）matter of fact and formal D）informal and matter of fact
Questions 36 to 40 are based on the following passage：
Are you aware that you actually possess six senses？The sixth is a muscular sense responsible for directing your muscles intelligently to the exact extent necessary for each action you perform．For example，when you reach for an object，the sensory nerves linking the muscles to the brain stop your hand at the correct spot．This automatic perception of the position of your muscles in relation to the object is your muscular sense in action．
Muscles are stringy bundles of fibers varying from one five thousandth of an inch to about three inches．They have three unique characteristics： they can become shorter and thicker；they can stretch；and they can retract to their original po- sition．Under a high-powered microscope，muscle tissue is seen as long，slender cells with a grainy texture like wood．
More than half of a person's body is composed of muscle fibers，most of which are involuntary，in other words，work without conscious direction．The voluntary muscles，those that we move consciously to perform particular actions，number more than five hundred．Women have only 60 to 70 percent as much muscle as men for their body mass．That is why an average woman can't lift as much，throw as far，or hit as hard as an average man．
36．According to the selection，more than half of a person's body is composed of ____ ．
A）involuntary muscles B）muscle fibers
C）sensory nerves D）voluntary muscles
37．Intelligent use of the muscles means that ____ ．
A）one improves muscular action consciously
B）one always knows what his muscles are doing
C）one's muscles are used only to the extent necessary for each action they perform
D）one perform simple actions without working
38．An average woman is weaker than an average man because she has ____ ．
A）60to 70percent less muscle for her body mass
B）only 60to 70percent as much musc1e for her body mass as an average man
C）less muscle fiber for her body weight
D）more voluntary muscles than an average man
39．Which of the following statements is implied but not stated？
A）Muscular sense involves automatic perception．
B）There are more than 500involuntary muscles in the body．
C）Muscle tissue is inflexible．
D）The muscular sense is more important than any other sense．
40．According to the passage，the muscular sense is responsible for ____ ．
A）the normal breathing function
B）the work of only our voluntary muscles
C）directing our muscles intelligently
D）the efficiency of our muscles
Part III Vocabulary and Structure（20 minutes）
Directions：There are 30incomplete sentences in this part．For each sentence there are four choices marked A），B），C）and D）．Choose the ONE that best completes the sentence．Then mark the corresponding letter on the Answer Sheet with a single line through the centre．
4l．By the time jet aircraft could fly at a speed faster than sound，train transportation in the United States ____ over several decades．
A）was declining B）had been declining
C）has declined D）declined
42．Had Australia not been colonized by the British，English ____ there now．
A）will not be spoken B）is not spoken
C）would not have been spoken D）would not be spoken
43．I should like to rent a house，modern，comfortable and ____ in a quiet environment．
A）before all B）first of all
C）after all D）above all
44．This ____ was conducted to find out how many people prefer butter．
A）examination B）inspect C）survey D）analysis
45．There are some hobbies that can only be by people with plenty of time and money．
A）taken on B）taken over C）taken up D）taken in
46．He gave much attention and thought to his children．
A）looking out B）keeping up C）bringing up D）making out
47．It is estimated that the engine of this model is as twice powerful as the ____ one．
A）prior B）early C）former D）previous
48．His parents ____ of me whether we adapted to the new college life．
A）investigated B）knew C）heard D）inquired
49．Before leaving his office，the manager showed no sign of ____ our proposals．
A）bringing about B）showing off
C）responding D）pointing out
50．Please keep ____ about what you have just heard．
A）quiet B）still C）silent D）voiceless
51．We shall not succeed in controlling world population ____ we improve living conditions．
A）as B）unless C）while D）if
52．Candidates who wish to ____ from the examination must notify the secretary immediately．
A）resign B）remove C）suspend D）withdraw
53．I never expect you to ____ at the meeting．I thought you were abroad．
A）turn on B）turn out C）turn up D）turn off
54．The cost of the operation will need to be ____ very precisely．
A）carried out B）cut out C）filled out D）figured out
55．It was not until he had arrived home that he remembered not to be ____ that the safe was locked．
A）confirmed B）believed C）told D）assured
