Part V Cloze (15 minutes)
Drections: There are 20 blanks in the following passage. For each blank there are four choices marked [A], [B], [C] and[D] on the right side of the paper. You should choose the ONE that best fits into the passage. Then mark the corresponding letter on Answer Sheet 2 with a single line through the center.
注意：此部分试题请在答题卡2上作答。
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 67 our protective blanket on 68 . Light gets through, and this is essen- tial 69 plants to make the food which we 70 Heat, 71 , makes our environments tolerable and some ultraviolet rays (紫外线) penetrate the 72 . Cosmic ( 宇宙的) rays of various kinds come 73 the air from outer space, but 74 quantities of radiation from the sun are
screened off. As 75 as men leave the atmosphere they are 76 to this radiation; 77 their spacesuits or the walls of their spacecraft, if they are inside, 78 prevent a lot of radiation damage.
Radiation is the greatest known danger to explorers in 79 . Doses of radiation are measured in 80 called "rems (雷姆 )". We all 81 radiation here on earth from the sun, from cosmic rays and from radioactive minerals.
The " 82 " dose of radiation that we receive each year is about 100 millirems; it 83 according to where you live, and this is a very rough estimate. Scientists have reason to think 84 a man can 85 up with far more radia- tion 86 this without being damaged; the figure of 60 rems has been agreed.
67. [A] for
[B] with
[C] on
[D] as
68. [A] stars
[B] sun
[C] earth
[D] space
69. [A] with
[B] from
[C] under
[D] for
70. [A] use
[B] live
[C] eat
[D] get
71. [A] again
[B] also
[C] besides
[D] too
72. [A] environment
[B] space
[C] atmosphere
[D] earth
73. [A] across
[B] to
[C] from
[D] through
74. [A] valid
[B] enormous
[C] various
[D] proper
75. [A] soon
[B] well
[C] much
[D] possible
76. [A] shown
[B] exposed
[C] faced
[D] covered
77. [A] but
[B] because
[C] so
[D] for
78. [A] get
[B] make
[C] have
[D] do
79. [A] earth
[B] atmosphere
[C] space
[D] environment
80. [A] pieces
[B] units
[C] parts
[D] elements
81. [A] receive
[B] accept
[C] bring
[D] catch
82. [A] conventional
[B] common
[C] general
[D] normal
83. [A] shifts
[B] converts
[C] modifies
[D] varies
84. [A] what
[B] which
[C] that
[D] why
85. [A] put
[B] keep
[C] come
[D] catch
86. [A] from
[B] than
[C] as
[D] away
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