训练内容：补全短文& 完形填空
训练要求：
一、补全短文(第 46～50题，每题2分，共10分) 阅读下面的短文，文章中有5处空白，文章后面有6组文字，请根据文章的内容选择5组文字，将其分别放回文章原有位置，以恢复文章原貌。请将答案涂在答题卡相应的位置上。
Why Study Mathematics
There’s something else you shouldn’t forget. There are lots of times when more math would help you in your everyday affairs.
No long ago a man in Milwaukee was arrested for speeding. The policeman, who had been stationing at a street corner, didn’t check the speed on the man’s motorcycle, but just guessed at it. 46 .
The man said that he had stopped his car at the traffic light on the corner where the policeman was stationed. 47 . The driver then proved mathematically that no car could have picked up speed fast enough to be exceeding the limit at the spot where he was arrested. The judge let him off. 48 . You may be the kind of person who needs to know something about advanced math to get the most out of life. Some people go on from day to day, having a good time and not caring much about anything else. 49 .
They’re interested in life, and other people, and what makes things happen the way they do. 50 .
If you’re that kind of person, you almost have to learn something about the more advanced branch of math. There will be no other way to understand the things you become curious about.
A The policeman admitted this
B But many people aren’t content to live that way
C They are curious about things
D But there’s one more reason why you should study math now
E The man admitted this
F The man and the policeman went before a judge in the police court
二、完形填空(第51～65题，每题1分，共15分) 阅读下面的短文，文中有15处空白，每处空白给出4个选项，请根据短文的内容从4个选项中选择1个最佳答案，涂在答题卡相应的位置上。
Avalanche and Its Safety
An avalanche is a sudden and rapid flow of snow, oftn mixed with air and water, down a mountainside. Avalanches are 51 the biggest dangers in the mountains for both life and property.
All avalanches are caused by an over-burden of material, typically snowpack, that is too massive and unstable for the slope 52 supports it. Determining the critical load, the amount of over-burden which is 53 to cause an avalanche, 54 a complex task involving the evaluation of a number of factors.
Terrain slopes flatter than 25 degrees or steeper than 60 degrees typically have a low 55 of avalanche. Snow does not 56 significantly on steep slopes; also, snow does not 57 easily on flat slopes. Human-triggered avalanches have the greatest incidence when the snow's angle of rest is 58 35 and 45 degrees; the critical angle, the angle at which the human incidence of avalanches is greatest, is 38 degrees. The rule of thumb is: A slope that is 59 enough to hold snow but steep enough to ski has the potential to generate an avalanche, regardless of the angle. Additionally, avalanche risk increases with 60 ; that is, the more a slope is disturbed by skiers, the more likely it is that an avalanche will occur.
Due to the complexity of the subject, winter travelling in the backcountry is never 100% safe. Good avalanche safety is a continuous 61 , including route selection and examination of the snowpack, weather 62 , and human factors. Several well-known good habits can also 63 the risk. If local authorities issue avalanche risk reports, they should be considered and all warnings should be paid 64 to. Never follow in the tracks of others without your own evaluations; snow conditions are almost certain to have changed since they were made. Observe the terrain and note obvious avalanche paths where plants are 65 or damaged. Avoid traveling below others who might trigger an avalanche.
51. A among
B of
C to
D in
52. A when
B that
C who
D whose
53. A mostly
B likely
C clearly
D surely
54. A are
B will be
C is
D was
55. A weight
B form
C risk
D work
56. A fall
B flow
C roll
D gather
57. A fall
B flow
C roll
D gather
58. A among
B between
C with
D for
59. A thick
B thin
C flat
D rocky
60. A use
B time
C snow
D rain
61. A journey
B trip
C fact
D process
62. A conditions
B reports
C forecast
D event
63. A increase
B reduce
C improve
D remove
64. A price
B effort
C attention
D money
65. A missing
B grown
C big
D fresh
第18期答案： 一、补全短文
46 F 47 A 48 D49 B 50 C
二、完形填空
51 A 52 B 53 B 54 C 55C
56 D 57 B 58B 59C 60A
61 D 62 A 63 B 64 C 65A
责任编辑：sealion1986
