五、补全短文(共1题，合计10分)
下面的短文有5处空白，短文后有6个句子，其中5个取自短文，请根据短文内容将其分别放回原有位置，以恢复文章原貌。
High Dive
Chery Sterns aims to go boldly where no human has ever gone before in a balloon: 40 kilometers up into the atmosphere. 46 No one has ever leapt from such a height or gone supersonic1 without an airplane or a spacecraft. Yet Sterns, an airline pilot, is not the only person who wants to be the first to accomplish those feats. Two other brave people, an Australian man and a Frenchman, are also planning to make similar leaps.
47 First, she’ll climb into a cabin hanging from a balloon the size of a football field. Then the balloon will take her high into the stratosphere — the layer of Earth’s atmosphere 12 to 50 kilometers above the planet. “The ascent will take two and a half to three hours.” said Sterns. “I’ll be wearing a fully pressurized, temperature-controlled space suit.”
At 40 kilometers, Sterns will be able to see the gentle curve of Earth and the blackness of space over head. Then she’ll unclip herself from the cabin and dive headfirst, like a bullet, into the atmosphere. 48
For high dive, astronaut escape suits are a key to success. Current pilot and astronaut escape suits are guaranteed only a maximum altitude of 21 kilometers. Del 医学全在线www.med126.comRosso, a NASA engineer of spacesuits and life-support systems, said the suit designed for Stern’s jump could serve as a model for the lethal environment of higher climbs. 49 The first hazard is oxygen-deficient air. Any person without an additional oxygen supply at 40 kilometers would die within three to five seconds. The second hazard is low atmospheric pressure. Atmospheric presure is much lower at high altitudes than it is at sea level. The low atmospheric pressure of the upper stratosphere causes the gases in body fluids to fizz out of solution like soda bubbles. 50 Other hazards include temperatures as low as -55 degrees Celsius, flying debris, and solar radiation.
For Sterns to survive, her spacesuit will have to protect her from all of these hazards. “A spacesuit is like a one-person spaceship,” Del Rosso explained. “You have to take everything you need in a package that’s light enough, mobile enough, and tough enough to do the job. You can’t exist without it.”
A. It will handle several major hazards.
B. Escape suits are tough enough to stand the atmospheric pressure of the upper stratosphere.
C. From there, she’ll take a death-defying leap back to Earth at supersonic speed.
D. “In 30 seconds, I’ll be going Mach (马赫) speed.” said Sterns.
E. How will Sterns make her giant jump?
F. In short, blood boils.
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六、完形填空(共1题，合计15分)
下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。
Avalanche and Its Safety
An avalanche is a sudden and rapid flow of snow, often ______ (51) with air and water, down a mountainside. Avalanches are among the biggest dangers in the mountains for both life and property.
All avalanches are ______ (52) by an over-burden of material, typically snowpack that is too massive and unstable for the slope that supports it. Determining the critical load, the______ (53) of over-burden which is likely to cause an avalanche, is a complex task involving the evaluation of a number of factors.
Terrain slopes flatter than 25 degrees or steep医学全在线www.med126.comer than 60 degrees ______ (54) have a low ______ (55) of avalanche. Snow does not______ (56) significantly on steep slopes: also, snow does not______ (57) easily on flat slopes. Human triggered avalanches have the greatest incidence when the snow’s angle of rest is ______ (58) 35 and 45 degrees; the critical angle, the angle at which the human incidence of avalanches is greatest is 38 degrees. The rule of thumb is: A slope that is______ (59) enough to hold snow but steep enough to ski has the potential to generate an avalanche, regardless of the angle. Additionally, avalanche risk increases with______ (60); that is, the more a slope is disturbed by skiers, the more likely it is that an avalanche will occur.
Due to the complexity of the subject, winter travelling in the backcountry is never 100% safe. Good avalanche safety is a continuous ______ (61), including route selection and examination of the snowpack, weather ______ (62), and human factors. Several well-known good habits can also ______ (63) the risk. If local authorities issue avalanche risk reports, they should be considered and all warnings should be paid ______ (64) to. Never follow in the tracks of others without your own evaluations: snow conditions are almost certain to have changed since they were made. Observe the terrain and note obvious avalanche paths where plants are _____ (65) or damaged. Avoid traveling below others who might trigger an avalanche.
51A. mixed B. mixing C. mixes D. have mixed
52A. increased B. caused C. removed D. encountered
53 A. clearly B. likely C. typically D. surely
54A. deal B. amount C. number D. much
55 A. weight B. form C. risk D. work
56A. fall B. flow C. roll D. gather
57A. fall B. flow C. roll D. gather
58 A. among B. between C. with D. for
59 A. thick B. thin C. flat D. rocky
60A. use B. time C. snow D. rain
61 A. journey B. trip C. fact D. process
62A. conditions B. reports C. forecast D. event
63A. increase B. reduce C. improve D. remove
64 A. price B. effort C. attention D. money
65A. missing B. grown C. big D. fresh
