完形填空

　　The world lost seven astronauts of Space Shuttle Columbia(哥倫比亞號(hào)航天飛機(jī)) thismonth. It brought home the serious risk that 1 face into the hostile environs beyond our 2 planets, raising the question of 3 exploring the heavens should be left to unmannedmissions.4 less exciting, such missions will 5 no risks to humans. And alreadyrobots have an impressive list of accomplishments 6 to their flesh and blood counterparts(職級(jí)地位相當(dāng)?shù)娜嘶蛭?.

　　“ 7 are all about specifically targeted scientific 8 of the universe around us.Without exceptions, these efforts rise out of intense competition 9 the most compelling,and answerable questions are 10 ,” said Marc Buie, an astronomer (天文學(xué)家) at LowellObservatory in Flagstaff, Arizona.11 have dug in the dirt on Mars, flown in the 12of Jupiter (木星), and driven by the moons of Neptune. A few are13approaching the boundary of the 14.

　　Humans, 15 , have mostly been going in circles, 16 above the surface of theplanet.17 the brief Apollo Mission triumphs on the 18 , almost 250,000 milesaway, humans have 19 gone farther than 400,000 miles from the planet, less than aday’s drive, although straight up. Humans fly near home for several reasons. There is thelogistics(后勤) of sending humans and what they need, like water, air and food, in a closedenvironment that keeps them 20.

　　1. A) humans B) stars C) planets D) robots

　　2. A) enclosed B) screened C) isolated D) sheltered

　　3. A) whether B) why C) if D) that

　　4. A) Moreover B) If C) But D) As

　　5. A) provide B) pose C) put on D) perform

　　6. A) related B) contrasted C) compared D) referred

　　7. A) Unmanned missions B) Space Shuttle Columbia

　　C) Space tours D) Apollo Mission

　　8. A) expeditions B) explorations C) investigations D) researches

　　9. A) which B) that C) where D) as

　　10. A) put B) suggested C) posed D) raising

　　11. A) Robots B) Humans C) Astronauts D) Astronomers

　　12. A) sky B) heavens C)moons D) atmosphere

　　13. A) also B) even C) still D)only

　　14. A) universe B) solar system C) space D) moon

　　15. A) consequently B) hence C)at any rate D) on the other hand

　　16. A) seldom B) never C)barely D) almost

　　17. A) Besides B) Except C) Excluding D) Other than

　　18. A) Mars B) moon C) planet D) Jupiter

　　19. A) never B) seldom C) once D) ever

　　20. A) safe B) warm C) alive D) active

　　答案解析在下一頁(yè)。。。

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