When will the new system go into effect？
A. On Tuesday
B. On Friday
C. On Sunday
D. On Monday
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Who is Elizabeth Kendall？
A customer of Hamala Inc.
B. A personnel manager at Hamala Inc.
C. A university professor
D. A famous reporter
What will the man probably do to go to Las Vegas？
A. Pay $320 for the ticket
B. Cancel his plan
Change his flight date
D. Take the first class
What is the main idea of the last paragraph？
A. Modern discoveries are the same as Darwin's.
B. Fossils are also very important in modern research.
C. Modern technology proves that Darwin was not quite fight.
D. Modern research is more advanced than Darwin's in many ways.
下列选项中，不属于焊接后致密性试验的一项是()。
A. 氨气试验
B. 氦气试验
C. 煤油试验
D. 空气压缩试验
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