一、完形填空
KEY→P17
范畴:人与社会 主题:技术创新 体裁:说明文 难度:★★★ 建议用时:9分钟 评价:/15
A new tool can help people breathe if they are stuck under snow after an avalanche(雪崩). Avalanches are when lots of ice, rock and snow 1 a mountain. They can be deadly—about 100 people in Europe die in avalanches every year.

The danger is not just from being hit by all that snow; it's the 2 of being buried. People who are buried under snow often run out of oxygen. In fact, about two-thirds of people run out of 3 in 35 minutes.
Researchers wanted to 4 how well a new tool, called Safeback SBX, could help people breathe under snow. Safeback SBX is a kind of fan that is part of a 5 . The user wears it like a backpack and 6 they get buried in snow, they can pull a handle that starts the fan. This pushes air from the snow into 7 that run through the shoulder straps(肩带) and blows the air into the person's face. The SBX system weighs about the same as a glass of milk.
Most of the people with the Safeback SBX system 8 to stay buried for the study's full 35 minutes. The 12th 9 early because his skin was getting irritated(疼痛的). However, only one person on the team with the fake(伪的) tool could 10 the full 35 minutes. Four of them asked to stop the test because they didn't 11 well. The other volunteers with the fake tool were asked to stop after a few minutes because researchers saw that oxygen levels in their blood were too 12 .
The researchers said the tool worked really well in the test. The volunteers with the SBX tool stayed 13 for about five times longer than those without it. Although the trial only tested the volunteers for 35 minutes, the company says the 14 can help people breathe for 90 minutes. That means rescuers would have much 15 time to find and dig out anyone stuck under the snow. The writers of the study said, "This tool is highly effective in prolonging survival."
——文章选自 The Week Junior UK
()1. A. go away
B. fall down
C. break up
D. take off
()2. A. risk
B. need
C. hope
D. plan
()3. A. water
B. food
C. air
D. light
()4. A. save
B. make
C. sell
D. test
()5. A. backpack
B. jacket
C. glove
D. hat
()6. A. unless
B. although
C. if
D. because
()7. A. ropes
B. pipes
C. wires
D. boxes
()8. A. tried
B. forgot
C. refused
D. managed
()9. A. stopped
B. arrived
C. waited
D. changed
()10. A. leave
B. jump
C. stay
D. shout
()11. A. look
B. feel
C. taste
D. sound
()12. A. high
B. normal
C. strange
D. low
()13. A. safe
B. busy
C. tired
D. worried
()14. A. fan
B. tool
C. bag
D. air
()15. A. harder
B. shorter
C. longer
D. easier

完形填空
本文介绍了一款名为 Safeback SBX 的雪崩救援工具，它能帮助被雪掩埋者维持呼吸、延长存活时间。实验证明该工具效果显著，可为救援争取更多时间。
1. B 雪崩是指大量的冰、岩石和雪从山上落下。fall down 意为“落下”，符合文意。
2. A 由“危险不仅仅来自被大雪击中”，下文递进表示：还有被掩埋的风险。
3. C 由“埋在雪下的人经常会缺氧”可知，下文表示：大约三分之二的人在 35 分钟内就会耗尽空气。
4. D 研究人员想测试一种名为 Safeback SBX 的新设备能多好地帮助人们在雪下呼吸。
5. A 由“使用者把它像背包一样背在身上”可知，上文表示：Safeback SBX 是背包的一部分。
6. C “他们被埋在雪里”与“拉动一个手柄来启动风扇”为条件关系，用 if 引导条件状语从句。
7. B 由“拉动手柄来启动风扇”可知，下文表示：将雪中的空气泵入穿过肩带的管道，然后吹到脸上。
8. D 大多数受试者都成功在被雪掩埋的状态下坚持完整个 35 分钟的研究测试。
9. A 上文提及大多数受试者成功完成测试，本句对应表示：第 12 位提前停止是因为皮肤变得疼痛。
10. C 句意：然而，使用假的设备的团队中只有一个人坚持了 35 分钟。
11. B 由“四人要求停止实验”可知，下文表示：因为他们感觉不舒服。
12. D 由“另一组使用假装置的志愿者在几分钟后就被要求停止试验”可知，下文表示：研究人员看到他们血液中的氧含量太低了。
13. A 由“该设备在试验中效果非常好”可知，携带Safeback SBX 设备的志愿者的安全时间比没有该设备的志愿者的长。
14. B 上文提及“该设备在试验中效果非常好”，本句对应表示：该设备能帮助人们呼吸 90 分钟。
15. C 那意味着救援者将有更长的时间来找到并挖出被埋在雪下的人。