第二篇
An Expensive Mistake
36. NASA built the Mars Climate Orbiter to get information about
A. possible life on Mars
B. the size of Mars
C. the shape of Mars
D. the atmosphere of Mars
37. How long zxtf.net.cndid it take the Orbiter to get close to Mars?
A. one year
B. less than one year
C. about two and a half year
D. more than three years
38. When did the Orbiter’s problem begin?
A. right after it left for Mars
B. when it got near Mars
C. right after it landed on Mars
D. when it returned to Earth
39. What caused the Orbiter’s problem
A. Scientists used wrong guidelines of mathematics
B. Scientists used wrong building materials
C. Scientists used different operating systems
D. Scientists used different measurement systemszxtf.net.cn
40. Why didn’t NASA scientists identify the problem before the Orbiter left for Mars
A. they didn’t know the English systemzxtf.net.cn
B. they were sure of the success of the trip
C. they didn’t get enough research funding
D. they were tired from working long hours
參考答案：ABBDD
第三篇
Operation Migration
41. whooping cranes migrate in winter to
A. find warmth and food
B. raise baby whooping cranes
C. get human help
D. lay eggs
42. whooping cranes are native to
A. North America
B. Mexicozxtf.net.cn
C. South America
D. the Persian Gulf
43. Operation Migration aims to
A. teach adult cranes how to fly
B. breed cranes in special parks
C. lead young cranes on their first trip south
D. transport cranes to the Northzxtf.net.cn
44. The distance covered by the young whooping cranes on their trip south is
A.120 miles
B.1931 miles
C.1200 miles
D.2000 miles
45. If operation Migration is successful , whooping cranes will
A. learn to migrate on their own
B. follow airplanes south every year
C. live in Canada all year round
D. be unable to fly back
參考答案：AACCA
