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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 2 . Light gets through, and this is essential 3 plants to make the food which we 4 .Heat, 5 , makes our environments tolerable and some ultraviolet rays(紫外线的) penetrate the 6 .Cosmic(宇宙的) rays of various kinds come 7 the air from outer space, but 8 quantities of radiation from the sun are screened off. 9 men leave the atmosphere they are 10 to this radiation; 11 their spacesuits or the walls of their spacecraft, if they are inside, 12 prevent a lot of radiation damage.Radiation is the greatest known danger to explorers in 13 . Doses of radiation are measured in 14 called"rems (雷目)". We all 15 radiation here on earth from the sun, from cosmic rays and from radioactive minerals.The " 16 "dose of radiation that we receive each year is about two millirems; it 17 according toswheresyou live, and this is a very rough estimate.Scientists have reason to think 18 a man can 19 far more radiation 20 without being damaged; the figure of 60 rems has been agreed.
1. A.for B.with C.on D.as
2. A.stars B.sun C.earth D.space
3. A.with B.from C.under D.for
4. A.use B.live C.eat D.get
5. A.again B.also C.besides D.too
6. A.environment B.space C.atmosphere D.earth
7. A.across B.to C.from D.through
8. A.valid B.enormous C.various D.proper
9. A.As soon as B.As well as C.As much as D.As possible as
10. A.shown B.exposed C.faced D.covered
11. A.but B.because C.so D.so that
12. A.get B.make C.have D.do
13. A.earth B.atmosphere C.space D.environment
14. A.pieces B.units C.parts D.elements
15. A.receive B.accept C.bring D.catch
16. A.conventional B.commonC.general D.normal
17. A.shifts B.converts C.modifies D.varies
18. A.what B.which C.that D.why
19. A.put up with B.keep up with C.come up with D.catch up with
20. A.from B.than C.as D.away
