Passage 5

    Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars. The atmosphere again acts __1__ our protective blanket on earth. Light gets through, and this is essential __2__ plants to make the food which we eat. Heat, __3__ , makes our environments tolerable and some ultraviolet rays (紫外線的) penetrate the atmosphere. Cosmic (宇宙的) rays of various kinds come __4__ the air from outer space, but a great quantity of radiation from the sun are screened off. __5__ men leave the atmosphere they are exposed to this radiation; but their spacesuits or the walls of their spacecraft, if they are inside, __6__ prevent a lot of radiation damage. Radiation is the greatest known danger to explorers in __7__ . Doses of radiation are measured in units called “rems (雷目)”. We all __8__ radiation here on earth from the sun, from cosmic rays and from radioactive minerals. The “__9__” dose of radiation that we receive each year is about two millirems; it __10__ according toswheresyou live, and this is a very rough estimate.

    1. A.for B. with C. on D. as

    2. A. with B. from C. under D. for

    3. A. again B. also C. besides D. too

    4. A. across B.to C. from D. through

    5. A. As soon as B. As well asC. As much as D. As possible as

    6. A. get B. make C. have D. do

    7. A. earth B. atmosphere C. space D. environment

    8. A. receive B. accept C. bring D. catch

    9. A. conventional B. commonC. general D. normal

    10. A. shifts B. converts C. modifies D. varies

    1.【答案】D

    【解析】act as “充當(dāng)、起……作用”；act for “代表、代理”；act on “按照”。本句意為大氣層起到保護(hù)傘的作用。

    2.【答案】D

    【解析】be essential for “對……來說是首要的、基礎(chǔ)的”，固定搭配。

    3【答案】D

    【解析】本句意為：熱不僅使我們的生產(chǎn)環(huán)境溫度適宜，而且紫外線也能穿透大氣。also一般緊跟動詞；besides一般用在句前；too可用在句中，用逗號隔開。

    4.【答案】D

    【解析】這里的come through相當(dāng)于penetrate，穿透。come across “偶遇”；come to “來到”；come from “來自”。本句意為：各類來自外部空間的宇宙射線穿透大氣層……，故選come through。

    5.【答案】A

    【解析】as soon as “只要”；as well as “除……之外”；as much as “和……一樣多”；as possible as “盡可能的”。

    6.【答案】D

    【解析】do +動詞原型的結(jié)構(gòu)表示強(qiáng)調(diào)謂語動詞。來源：www.examda.com

    7.【答案】C

    【解析】由radiation和explorers可推測，應(yīng)選space (太空)。本句意為射線是探險(xiǎn)者在太空遇見的已知的最大危險(xiǎn)。

    8.【答案】A

    【解析】receive表示客觀收到；accept表示主觀接受。我們受到的輻射并非主觀接受。

    9.【答案】D

    【解析】conventional “傳統(tǒng)的”；common “共同的、普通的”；general “一般的、總體的”；normal “正常的”。本句意為：我們每年接受的正常輻射量……，故選normal。

    10.【答案】D

    【解析】shift “移動”；convert “轉(zhuǎn)換”；modify “修改”；vary “變化”。根據(jù)句意，所處地點(diǎn)不同，所受輻射量也不一樣……，故選varies.

  Passage 6

As the plane circled over the airport, everyone sensed that something was wrong. The plane was moving unsteadily through the air, and __1__ the passengers had fastened their seat belts, they were suddenly thrown forward.At that moment, the air-hostess __2__ . She looked very pale, but was quite calm. Speaking quickly but almost in a whisper, she __3__ everyone that the pilot hadfainted and asked if any of the passengers knew anything about machines or at __4__ how to drive a car. After a moment hesitation, a man got up and followed the hostesssintosthe pilot cabin.Moving the pilot __5__ , the man took his seat and listened carefully to the urgent instructions that were being sent by radio from the airport __6__ . The plane was now dangerously close to the ground, but to everyone relief, it soon began to climb.The man had to __7__ the airport several times insgroupsto become __8__ with the controls of the plane. But the danger had not yet passed.The terrible __9__ came when he had to land. Followinginstructions, the man guided the plane toward the airfield. It shook violently __10__ it touched the ground and then moved rapidly along the runway and after a long run it stopped safely.

    1. A. although B. while C. therefore D. then

    2. A.showed B. presented C. exposed D. appeared

    3. A.inquired B. insured C. informed D. instructed

    4. A. best B. least C. length D. first

    5. A. back B. aside C. about D. off

    6. A. beneath B. under C. down D. below

    7. A. surround B. circle C. observe D. view

    8. A. intimate B. familiar C. understood D. close

    9. A. moment B. movement C. idea D. affair

    10. A. as B. unless C. while D. so

    1.【答案】A

    【解析】本句意為盡管乘客們都已經(jīng)系好安全帶，他們還是被突然向前拋去。although盡管，引導(dǎo)讓步狀語從句，符合句意。while當(dāng)……時(shí)候；therefore因此；then接著、然后。

    2.【答案】D

    【解析】show展示、表明；present呈現(xiàn)、陳述，及物動詞；expose暴露。appear出現(xiàn)，符合句意。

    3.【答案】C

    【解析】inform通知、告訴，符合句意。inquire詢問；insure保險(xiǎn)、投保，常與aginst連用；instruct指示、指令。

    4.【答案】B

    【解析】at best最多、至多；at least至少；at length詳細(xì)地；at first開始、最先。at least句意。

    5.【答案】B

    【解析】本句意為把飛行員挪到一邊。aside意為一邊、旁邊，符合句意。back向后；about到處；move off指車輛啟程。

    6.【答案】D

    【解析】beneath和under為介詞，后面必需接名詞。down向下地，副詞。below在下方地，副詞，符合句意。

    7.【答案】B

    【解析】surround包圍；circle盤旋；observe觀察；view認(rèn)為。此處選擇circle，句意。

    8.【答案】B

    【解析】be familiar with為固定搭配，意為熟悉，排除其他選項(xiàng)。

    9.【答案】A

    【解析】根據(jù)句意推斷，空格處所填詞應(yīng)與when he had做同位語，故moment符合句意。movement運(yùn)動，idea想法，affair事件。

    10.【答案】A

    【解析】as當(dāng)……的時(shí)候，符合句意。unless除非。while當(dāng)……時(shí)候，它引導(dǎo)的從句動作時(shí)間比as引導(dǎo)從句動作的時(shí)間要長。So因此，表結(jié)果，不符合句意