第五部分：補(bǔ)全短文(第46～50題，每題2分，共10分)
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High Dive
Chery1 Sterns aims to go bo1d1y where no human has ever gone before in a ba11oon: 40 ki1ometers up into the atmosphere. 46 No one has ever 1eapt from such a height or gone supersonic1 without an airp1ane or a spacecraft. Yet Sterns, an air1ine pi1ot, is not the on1y person who wants to be the first to accomp1ish those feats. Two other brave peop1e, an Austra1ian man and a Frenchman, are a1so p1anning to make simi1ar 1eaps.
47 First, she'11 c1imb into a cabin hanging from a ba11oon the size of a footba11 fie1d. Then ba11oon wi11 take her high into the stratosphere--the 1ayer of Earth's atmosphere 12 to 50 ki1ometers above the p1anet. “The ascent wi11 take two and a ha1f to three hours,” said Sterns. “I'11 be wearing a fu11y pressurized, temperature-contro11ed space suit. ”
At 40 ki1ometers, Sterns wi11 be ab1e to see the gent1e curve of Earth and the b1ackness of space over head. Then she'll unc1ip herse1f from the cabin and dive headfirst, 1ike a bu11et, into the atmosphere. 48
For high dive, astronaut escape suits are a key to success. Current pi1ot and astronaut escape suite are guaranteed on1y a maximum a1titude of 21 ki1ometers.
De1 Rosso, a NASA engineer of spacesuits and 1ife-support systems, said the suit designed for Stern's jump cou1d serve as a mode1 for the 1etha1 environment of higher c1imbs. 49 The first hazard is oxygen-deficient air. Any person without an additiona1 oxygen supp1y at 40 ki1ometers wou1d die within three to five seconds. The second hazard is 1ow atmospheric pressure. Atmospheric pressure is much 1ower at high a1titudes than it is at sea 1eve1. The 1ow atmospheric pressure of the upper stratosphere causes the gases in body f1uids to fizz out of so1ution 1ike soda bubb1es. 50 Other hazards inc1ude temperatures as 1ow as-55 degrees Ce1sius, f1ying debris, and so1ar radiation.
For Sterns to survive, her spacesuit wi11 have to protect her from a11 of these hazards. “A spacesuit is 1ike a one-person spaceship,” De1 Rosso exp1ained. “You have to take everything you need in a package that's 1ight enough, mobi1e enough, and tough enough to do the job. You can't exist without it. ”
A It wi11 hand1e severa1 major hazards.
B Escape suits are tough enough to stand the atmospheric pressure of the upper stratosphere.
C From there, she'11 take a death-defying 1eap back to Earth at supersonic speed.
D “In 30 seconds, I'11 be going Mach (馬赫) speed,” said Sterns.
E How wi11 Sterns make her giant jump?
F In short, b1ood boi1s.
