完形填空
The world lost seven astronauts of Space Shuttle Columbia(哥伦比亚号航天飞机) 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(职级地位相当的人或物).
“ 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 (天文学家) 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
