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.

【参考答案】

几乎可以肯定地说，未来的主要光源不再会是灯泡，而可能是桌子、墙壁，甚至是餐叉。
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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.
填空题
spent psychological energy
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