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四、阅读理解
36、 回答36-55题
Nature has devised many ways to protect creatures' eyes． The most common protection is the eyelid--a fold of skin that closes over the eye, protecting it from damage． Eyelashes are useful for keeping out dust and other irritants, and tears wash away any particles that get through the other defenses．
Some creatures, including most birds, have three eyelids． The upper and lower lids act like human lids and keep out twigs, dirt and sand． The third eyelid, however, is a semitransparent tissue that crosses over the eye from the inside corner to the outside corner． Because of this protective membrane, birds seldom have to blink． They close their eyes only when they go to sleep． In ducks, this third eyelid self as an underwater diving mask that helps the ducks find food．
Most fish and snakes have no eyelids at all． Instead, a hard glassy covering protects their eyes． In fish, water constantly sweeps away dirt from the covering． And a snake's eyesight is usually so bad that a little dirt obscuring its vision does not disturb it greatly．
Eyelashes defend the eye by shading it from glare． They also act like miniature brushes to remove dust． Camels have lashes that are four inches long to protect their eyes from windblown sand in the desert．

A camel has long eyelashes________
A．to keep windblown sand out of its eyes
B．that get in the way of its sight
C．to help it see better
D．to attract other camels


37、 The writer implies that eyelids are________
A．not found on lizards
B．nice to look at
C．always covered with eyelashes
D．the most effective eye protection


38、
The author compares the duck's third eyelid to a________
A．tissue
B．glassy covering
C．tiny brush
D．diving mask


39、
A good title for this passage would be________
A．Look Out
B．Birds' Eyes
C．Eyes in the Night
D．Protecting the Eye

40、 回答40-59题
To find out what the weather is going to be, most people go straight to the radio, television or newspaper to get an expert weather forecast．But if you know what to look for, you can use your own senses to make weather predictions．
There are many signs which can help you．For example, in fair weather the air pressure is generally high．The air is still and often full of dust．Faraway objects may look hazy．But when a storm is brewing, the pressure drops and you are often able to see things more clearly．Sailors took note of this long ago and came up with a saying "The farther the sight, the nearer the rain．"
Your sense of smell can also help you detect weather changes．Just before it rains, odors become stronger．This is because odors are repressed in a fair, high-pressure center．When a bad weather low moves in, air pressure lessens and odors are released．
You can also hear an approaching storm．Sounds bounce off heavy storm clouds and return to earth with increased force．An old saying describes it this way: "Sounds traveling far and wide, a storm day will betide．"
And don't scoff if your grandmother says she can feel a storm coming．It is commonly known that many people feel pains in their bones or in corns and bunions when the humidity rises, the pressure drops, and bad weather is on the way．

The topic of this passage could be
A．Expert Weather Forecast
B．Seeing Approaching Storms
C．Old Sayings about Weather
D．Using the Senses to Detect Weather Changes


41、 According to the passage, as a storm approaches, faraway objects look
A．hazy because of dust in the air
B．clearer because air pressure is high
C．clearer because air pressure is dropping
D．distorted because of storm clouds


42、
In the last paragraph, the writer implies that
A．the idea of feeling a coming storm is foolish
B．older people know a lot about weather
C．it is possible, but unlikely, that people feel aches when a storm is coming
D．it is definitely true that some people can feel coming weather changes


43、
The underlined word "repressed'' in paragraph 3 is close to in meaning．
A．crush
B．restrict
C．lower
D．struggle

44、回答44-63题
Many people want to know how to analyze problems they meet．There are six stages in analyzing a problem．First the person must recognize that there is a problem．For example, Sam's bicycle is broken,　and he cannot ride it to class as he usually does．Sam must see that there is a problem with his　bicycle．Next the thinker must define the problem．Before Sam can repair his bicycle, he must find the　reason why it does not work．For instance, he must determine if the problem is with the gears, the brakes, or the frame．He must make his problem more specific．Now the person must look for information that will make the problem clearer and lead to possible solutions．For instance, suppose Sam decided that his bike does not work because there is something wrong with the gear wheels．At this time, he can look in his bicycle repair book and read about gears．He can talk to his friends at the bike shop．After studying the problem, the person should have several suggestions for a possible solution．Take Sam as an illustration．His suggestions might be : put oil on the gear wheels ; buy new gear wheels and replace the old ones; tighten or loosen the gear wheels．Eventually one suggestion seems to be the solution to the problem．Sometimes the final idea comes very suddenly because the thinker suddenly sees something new or sees something in a new way．Sam, for example, suddenly sees that there is a piece of chewing gum between the gear wheels．He immediately realizes the solution to his problem: he must clean the gear wheels．Finally the solution is tested．Sam cleans the gear wheels and finds that　afterwards his bicycle
works perfectly．In short, he has solved the problem．

In analyzing a problem we should do all the following except________
A．recognize and define the problem
B．look for information to make the problem clearer
C．have suggestions for a possible solution
D．find a solution by trial or mistake


45、 By referring to Sam's broken bicycle, the author intends to________
A．illustrate the ways to repair his bicycle
B．discuss the problems of his bicycle
C．tell us how to solve a problem
D．show us how simple it is to repair a bicycle

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