下载亿题库APP
联系电话:400-660-1360
请谨慎保管和记忆你的密码,以免泄露和丢失
请谨慎保管和记忆你的密码,以免泄露和丢失
小伙伴们,今天的你有没有好好复习呢?好的成绩是坚持不懈的努力得来的,所以快和帮考网一起来练习吧!
托福阅读模拟试题
Bloodhounds are biologically adapted to trailing their prey. The process by which the nose recognizes an odor is not fully understood, but there are apparently specific receptor sites for specific odors. In one explanation, recognition occurs when a scent molecule fits into its corresponding receptor site, like a key into a lock, causing a (Line5) mechanical or chemical change in the cell. Bloodhounds apparently have denser concentrations of receptor sites tuned to human scents.
When a bloodhound trails a human being, what does it actually smell? The human body, which consists of about 60 trillion living cells, sheds exposed skin at a rate of 50 million cells a day. So even a trail that has been dispersed by breezes may still seem (Line10) rich to a bloodhound. The body also produces about 31 to 50 ounces of sweat a day. Neither this fluid nor the shed skin cells have much odor by themselves, but the bacteria working on both substances is another matter. One microbiologist estimates the resident bacteria population of a clean square centimeter of skin on the human shoulder at "multiples of a million." As they go about their daily business breaking (Line15) down lipids, or fatty substances, on the skin, these bacteria release volatile substances that usually strike the bloodhound\'s nose as an entire constellation of distinctive scents.
45. What does the passage mainly discuss?
(A) Why people choose bloodhounds for
household pets
(B) How a bloodhound\'s sense of smell works
(C) How humans compensate for an
underdeveloped sense of smell
(D) The way in which bacteria work on skin cells
and body sweat
46. The author compares a scent molecule with a
(A) key
(B) lock
(C) cell
(D) bloodhound
47. In line 7, the word "it" refers to
(A) bloodhound
(B) human being
(C) smell
(D) body
48. According to the passage, how many cells of
skin does the human body rid itself of every day?
(A) 60 trillion
(B) 50 million
(C) 1 million
(D) Between 31 and 50
49. In line 10, the word "rich" is used to mean that a
trail is
(A) paved with precious materials
(B) a profitable business to get into
(C) a very costly undertaking
(D) filled with an abundance of clues
50. Which of the following acts as a stimulus in the
production of the human scent?
(A) Sweat
(B) Dead skin cells
(C) Bacteria
(D) Fatty substances
参考答案:BAABDC
以上就是本次帮考网和大家分享的全部内容了,希望小伙伴们能够继续努力,相信最后一定会取得好成绩的。关注帮考网,还有更多有关考试练习在等着你哦!
托福考试中能否取消考试成绩?:托福考试中能否取消考试成绩?考生可以在考试结束之前选择取消本次成绩,至此考生本人和申请的学校都将无法查询成绩,也不会收到成绩单。考试结束后则不能再取消成绩。
托福考试如何计分?:托福考试如何计分?托福考试的四个环节,分数由电脑自动生成和人工评分(经过专业培训的权威人士)两部分组成,确保分数的公平及准确性。只有托福考试采用这种多人评分机制,通过不记名方式,由多名接受过严格培训的考官予以评分,过程经过质量监控,达到高标准的公平性与客观性。
托福考试的考场规则是什么?:托福考试的考场规则是什么?1.考生须服从考务人员的指令,不得大声喧哗扰乱考场秩序,有问题须举手示意等待考务人员前来解决。2.考生在考场的任何违规或舞弊行为都将被如实报告给ETS,违规或舞弊行为将会影响考生的考试成绩甚至考试资格。因违规舞弊而被取消考试成绩或考试资格的考生不得申请更改、退考或退款;情节严重者有可能被禁止参加以后的考试。