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

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