Question

完型填空： 　　Scientists now believe the earth’s magnetic poles(地磁极)have changed many times．One 　　1　　 change may have taken place about 330,000 BC．This 　　2　　 is about when modem man first 　　3　　 on the earth． 　　Many 　　4　　 now believe the magnetism(磁力现象)of the earth may have a 　　5　　 influence(影响)on life itself．In the 　　6　　 past many kinds of animals and plants died out suddenly, 　　7　　 the North and South magnetic poles changed 　　8　　． 　　Animals, birds and 　　9　　 people are to some degree controlled by magnetic forces When there is a 　　10　　 increase in magnetic strength; many animals have 　　11　　 in finding their way．Mice, 　　12　　 near a strong magnet, lose their hair and die 　　13　　．And when the earth’s magnetism suddenly decreases, the 　　14　　 of men or women who kill themselves increases． 　　How 　　15　　 does the earth’s magnetism 　　16　　 our lives?We cannot know for 　　17　　．We do know this magnetism is getting weaker and we know that in 2,500 years the magnetic poles may change position 　　18　　．And we know when 　　19　　．happened in the past there were enormous 　　20　　 in life on Earth． (1) [　　] A． similar B． such C． probable D． certain (2) [　　] A． year B． century C． date D． moment (3) [　　] A． appeared B． came C． produced D． made (4) [　　] A． people B． scientists C． experts D． specialists (5) [　　] A． surprising B． poor C． complete D． strong (6) [　　] A． far B． distant C． long D． deep (7) [　　] A． when B． if C． before D． after (8) [　　] A． place B． direction C． position D． use (9) [　　] A． also B． too C． some D． even (10) [　　] A． slow B． weak C． quick D． sudden (11) [　　] A． interest B． difficulty C． pride D． problem (12) [　　] A． lain B． placed C． come D． stayed (13) [　　] A． early B． late C． much D． quietly (14) [　　] A． ease B． fact C． number D． chance (15) [　　] A． long B． much C． old D． weakly (16) [　　] A． make B． cause C． connect D． control (17) [　　] A． certain B． clear C． free D． ever (18) [　　] A． too B． instead C． again D． often (19) [　　] A． those B． this C． that D． these (20) [　　] A． influences B． effects C． movements D． changes

Answer 1

答案：1．D;2．C;3．A;4．B;5．D;6．B;7．A;8．C;9．D;10．D;11．B;12．B;13．A;14．C;15．B;16．D;17．A;18．C;19．B;20．D;
解析：

(1)	“such”表示“像前面提及的那样的，上述一样的，如此的”。
(2)	“date”为“(古物等所属的)时代，年代”。
(3)	句意为“这个年代大约是现代人第一次出现在地球上的时候”。
(4)	前文已出现过提示词“scientists”。
(5)	根据下文对动物和人的反应的描写可知，地磁现象对生命有很强的影响力。
(6)	根据所学历史知识可知，大量动物突然灭绝发生在远古时代。
(7)	“when”从句说明动物灭绝的时间。
(9)	“even”为“甚至、即使”，用来加强语气。
(11)	“have difficulty in doing sth．”为“做……有困难”。
(12)	“placed near…”为“Mice”的非限制性定语。
(13)	句意为“放在强磁场附近的老鼠会掉毛发并且早死”。
(15)	此句是对程度提出的疑问。
(17)	“for certain”相当于“certainly”为“无疑的”。
(19)	“this”用来指前面提到过的某人或某事，带有近指含义。
(20)	“influence”和“effect”两词后搭配的介词是“on”而不是“in”。