What is the author's main concern?
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1 .Millions tons of ash will be injected into the air during the volcanic eruption, which ______.
A will be responsible for more death of respiratory illness worldwide. B will lower the temperature of the earth. C will cause serious air pollution D will lead to people’s heart disease E will cause the movement of homeless people and refugees F will seriously affect the local economy.
2 .Volcanic eruption may indirectly lead to some instability in the region, because it ______.
A will be responsible for more death of respiratory illness worldwide. B will lower the temperature of the earth. C will cause serious air pollution D will lead to people’s heart disease E will cause the movement of homeless people and refugees F will seriously affect the local economy.
3 .In the volcanic eruption in Iceland, many flights had been canceled in different countries, which ______.
A will be responsible for more death of respiratory illness worldwide. B will lower the temperature of the earth. C will cause serious air pollution D will lead to people’s heart disease E will cause the movement of homeless people and refugees F will seriously affect the local economy.
4 .The volcanic eruption can produce a sort of glassy material with sharp edges, which _______.
A will be responsible for more death of respiratory illness worldwide. B will lower the temperature of the earth. C will cause serious air pollution D will lead to people’s heart disease E will cause the movement of homeless people and refugees F will seriously affect the local economy.
5 .One significant improvement in the future car will probably be_____.
A its power source B its driving system C its monitoring system D its seating capacity
7 .What provides autos with electric power in an automated highway system?
A a rail B an engine C a retractable arm D a computer controller
8 .In an automated highway system, all the drivers need to do is_____.
A keeping in the right lane B waiting to arrive at his destination C keeping in constant touch with the computer center D informing the system of his destination by phone
9 .What is the author's attitude toward the future of autos?
A Enthusiastic B Pessimistic C optimistic D Cautious
10 .What was scientists' understanding of methane?
A It was produced from plants. B It was not a greenhouse gas. C It was produced in oxygen-free environments. D It traps more heat than any other greenhouse gas.
