A.Scientists used wrong guidelines of mathematics.
B.Scientists used wrong building materials.
C.Scientists used different operating systems.
D.Scientists used different measurement systems.
40、 Why didnt NASA scientists identify the problem before the orbiter left for Mars?
A.They didnt know the English system.
B.They were sure of the success of the trip.
C.They didnt get enough research funding.
D.They were tired from working long hours.
Operation Migration
If you look up at the sky in the early fall in the northern part of North America , you may see groups of birds. These birds are flying south to places where they can find food and warmth for the winter. They are migrating ( 迁徙 ). The young birds usually learn to migrate from their parents. They follow their parents south, in one unusual case, however, the young birds are following something very different. These birds are young whooping cranes, and they are following an airplane!
The whooping crane is the largest bird that is native to North America . These birds almost disappeared in the 1800s. By 1941, there were only about 20 cranes alive. In the 1970s, people were worried that these creatures were in danger of disappearing completely. As a result, the United States identified whooping cranes as an endangered species that they needed to protect.
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