1、a.allows too many branches to grow in the middleb.does not protect them from windc.forces them to grow too quicklyd.damages some of the small side branches3.Why is a special substance painted on the tree?a.To make a wound smoothb.To prevent disease entering a woundc.To cover a rough surfaced.To help
2、 a wound to dry4.A good gardener prunes a tree_.a.at intervals throughout the yearb.as quickly as possiblec.occasionally when necessaryd.regular every winter5.What was the authors purpose when writing this passage?a.To give pratical instruction for pruning a tree.b.To give a general description of p
3、runingc.To explain how trees develop diseasesd.To discuss different methods of pruning.答案：babca十七 On Thursday afternoon Mrs. Carke, dressed for going out, took her handbag with her money and her key in it, pulled the door behind her to lock it and went to the over 60s Club. She always went there on
4、Thursdays. It was a nice outing for an old woman who lived alone.At six oclock she cane home, let herself in and at once smelt cigarette smoke. Cigarette smoke in her house? How? Had someone got in? She checked the back door and the windows. All were locked or fastened, as usual. There was no sign o
5、f forced entry.Over a cup of tea she wondered whether someone might have a key that fitted her front door-a master keyperhaps. So she stayed at home the following Thursday. Nothing happened. Was anyone watching her movements? On the Thursday after that she went out at her usual time,dressed as usual
6、, but she didnt go to the club. Instead she took a short cut home again, letting herself in through her garden and the back door. She settled down to wait.It was just after four oclock when the front door bell rang.Mrs. Clarke was making a cup of tea at the time. The bell rang again, and then she he
7、ard her letter-box being pushed open. With the kettle of boiling water in her hand, she moved quietly towards the front door. A long piece of wire appeared through the letter-box, and then a hand. The wire turned and caught around the knob on the door-lock. Mrs. Clarke raised the kettle and poured t
8、he water over the hand. There was a shout outside, and the skin seemed to drop off the fingers like a glove. The wire fell to the floor, the hand was pulled back, and Mrs. Clarke heard the sound of running feet.1.Mrs. Clarke looded forward to Thursday because_.a.she worked at a club on the dayb.she
9、said visitors on Thursdaysc.she visited a club on Thursdayd.a special visitor came on Thursday2.If someone had made a forced entery,_.a.Mrs.Clarke would have found a broken door or windowb.he or she was still in the housec.things would have been thown aboutd.he or she would have needed a master key3
10、.On the third Thursday Mrs. Clarke went out_.a.because she didnt want to miss the club againb.to see if the thief was hnging about outsidec.to the club but then changed her mindd.in an attempt to trick the thief4.The lock on the front door was one which_.a.needed a piece of wire to open itb.could he
11、 opened from inside without a keyc.couldt be opened without a keyd.used a knob instead of a key5.The wire feel to the floor_.a.because Mrs.Clarke refused to open the doorb.when the mans glove dropped offc.because it was too hot to holdd.because the man justwanted to get awaycadbd十八 Many people belie
12、ve the glare from snow causes snowblindnenss. Yet, dark glasses or not , they find themselves suffering from headaches and watering eyes,and even snowblindness,when exposed to several hours of snow light .The United States Army has now determined that glare from snow does not cause snowblindness in
13、troops in a snow-covered country.Rather, a mans eyes frequently find nothing to foucs on in a broad expanse of barren snow-covered terrain. So his gaze continually shifts and jumps back and forth over the entire landscape in search of tsomething to look at. Finding nothing, hour after hour, the eyes
14、 never sotp searching and the eyeballs become sore and the eye muscles ache. Nature offsets this irritation by producing more and fluid which covers the eyeball. The fluid coversthe eyeball in increasing quantity until vision blurs, then is obsured,and the result is total, even though temporary,snow
15、blindness.Experiments led the Army to a simple method of overcoming this problem. Scouts ahead of a main body of troops are trained to shake snow from evergreen bushes, creating a dotted line as they cross completely snow-covered landscape,Even the scouts themselves throw lightweight , dark colored
16、objects ahead on which they too can focus . The men following can then see something.Their gaze is arrested. Their eyes focus on a bush and having found something to see,stop scouring the snow-blanketed lanscape. By focusing their attention on one object at a time,the men can cross the snow without
17、becoming hopelessly snowblind or lost. In this way the problem of crossing a solid white terrain is overcome.1.To prevent headaches, watering eyes and blindness caused by the glare from snow, dark glasses are_.a.indispensibleb.usefulc.ineffectived.available2.When the eyes are sore tears are produced
18、 to _.a.clear the visionb.remedy snowblindnessc.ease the irritationd.loosen the muscles3.Snowblindness may be avoided by_.a.concentrating to the solid white terrainb.searching for something to look at in snow-covered terrainc.providing the eyes with something to foucs ond.covering the eyeballs with
19、fluid4.The scouts shake snow from evergreen bushes in order to _.a.bive the men behind something to seeb.beautify the landscapec.warm themselves in the coldd.prevent the men behind from losing their way5.A suitable title for this passage would be _.a.snowblindness and how to overcome itb.natrues cur
20、e for snowblindnessc.soldiers in the snowd.snow visionCCCAA十九 Water problems in the future will become nore intense and more complex. Our increasing population will tremendously increase urban wastes,primarily sewage. On the other hand, increasing demands for water will decease substantialy the amou
21、nt of water available for diluting wastes. Rapidly expanding industries which involve more and more complex chemical processes will produce large volumes of liquid wastes, and many of these will contain chemicals which are noxious. To feed our rapidly expanding population, agriculture will have to b
22、e intensified. This will involve ever-increasingquantities of agricultural chemicals, From this , it is apparent that drastic steps must be taken immediately to develop corrective measures for the pollution problem.There are two ways by which this pollution problem can be dwindled. The first relates
23、 to the treatment of wastes to decrease their pollution hazard. This involves the processing of solid wastes prior to disposal and the treatment of liquid wastes, or efflunets,to permit the reuse of the water or minimize pollution upon final disposal.A second approach is to develop an economic use f
24、or all or a part of the wastes. Farm manure is spread in fields as a nutrient or organic supplement . Effluents from sewage disposal plants are used in some areas both for irrigation and for the nutrients contained. Efflunets from other processing plants may also be used as a supplemental source of
25、water. Many industries, such as meat and poultry processing plants, are currently converting former waste products into marketable byproducts. Other industries are potential eonomic uses for waste products.1.The purpose of this passage is _.a.to alert the reader to the dwindling water supplyb.to explain industrial uses of waterc.to acquaint the reader with w
