Space is a dangerous place, not only because of meteors 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 penetrate the 6 .Cosmic 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 calledrems .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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新概念英语第一册 Lesson 119:A true story
新概念英语第一册 Lesson 41:Penny’s bag
新概念英语第一册 Lesson 105:Full of mistakes
新概念英语第一册 Lesson 77:Terrible toothache
新概念英语第一册 Lesson 111:The most expensive model
新概念英语第一册 Lesson 51:A pleasant climate
新概念英语第一册 Lesson 113:Small change
新概念英语第一册 Lesson 75:Uncomfortable shoes
新概念英语第一册 Lesson 47:A cup of coffee
新概念英语第一册 Lesson 61:A bad cold
新概念英语第一册 Lesson 83:Going on holiday
新概念英语第一册 Lesson 89:For sale
新概念英语第一册 Lesson 115: Knock,knock
新概念英语第一册 Lesson 133:Sensational news
新概念英语第一册 Lesson 97:A small blue case
新概念英语第一册 Lesson 101:A card from Jimmy
新概念英语第一册 Lesson 93:Our new neighbour
新概念英语第一册 Lesson 67:The weekend
新概念英语第一册 Lesson 43:Hurry up
新概念英语第一册 Lesson 103:The French test
新概念英语第一册 Lesson 85:Pairs in the spring
新概念英语第一册 Lesson 137:A pleasant dream
新概念英语第一册 Lesson 117: Tommy’s breakfast
新概念英语第一册 Lesson 59:Is that all
新概念英语第一册 Lesson 107:It’s too small
新概念英语第一册 Lesson 63:Thank you,doctor
新概念英语第一册 Lesson 99:Owl
新概念英语第一册 Lesson 53:An interesting climate
新概念英语第一册 Lesson 135: The latest report
新概念英语第一册 Lesson 39:Don’t drop it