24.The purpose of this passage is to .
A.introduce space junk
B.describe what is space junk
C.advise us to how to clean space junk
D.inform us of the danger of space junk
解析:主旨归纳题。本文内容涉及三个方面:什么是太空垃圾、太空垃圾的危险性以及清理太空垃圾的重要性及措施。A项包括了这三个方面,故为最佳选项。
答案:A
B
AfraidofDentist’sOffice
Are you afraid of going to the dentist?If you are,what is it about that makes you so scared?
Shouldn’t going to the dentist be just like going to any other doctor?According to a recent survey by Martin Tickle,a professor at Manchester University,UK,pain is quite rare in dental surgeries—among the 451 interviewed patients,75 percent reported no pain at all during their visits,which even included occasions when they had their teeth extracted.
Could it be the sound of the drill,then?
“From my clinical experience,I found that the sound of drilling can evoke anxiety in dental patients,” Hiroyuki Karibe,a scientist at Nippon Dental University in Tokyo,told TheGuardian.
To find out why a drill might bring on a racing heart,Karibe asked volunteers to complete a questionnaire that measured how much they feared a trip to the dentist.He then divided the volunteers into low-fear and high-fear groups based on their answers.
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