单项选择题

Questions 23-26

A. The advantages of traditional surveying methods.
B. Using satellites to communicate with mountain climbers.
C. Obtaining new information about a mountain.
D. Controlling satellites from the top of a mountain.
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问答题
The main light source of the future will almost surely not be a bulb. It might be a table, a wall, or even a fork.
单项选择题
A. Though sunshine is free, we still need to purchase fuel to operate a solar heating system. B. We need to purchase a solar system before we can use the sunshine. C. If we want to use sunshine for the solar heating system, we must buy fuel first. D. It’s not necessary to buy fuel to run a solar heating system.
A. Though sunshine is free, we still need to purchase fuel to operate a solar heating system.
B. We need to purchase a solar system before we can use the sunshine.
C. If we want to use sunshine for the solar heating system, we must buy fuel first.
D. It’s not necessary to buy fuel to run a solar heating system.
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