1. What's people's usual reaction when they see a person throw a cigarette butt?
a. It varies.
b. It causes them to smoke.
c. He is to blame.
2. Filters can be made into a material that _________? ? ? ? ? ? ? ?.
a. is used as the battery surface
b. can be turned into electricity
c. can hold electricity energy wel
3. Super-capacitors made from carbon?_________? ? ? ? ? ? ? ? ?.
a. need quite a long time to recharge
b. can easily carry an electrical current
c. are comparatively very expensive
4. The story tells the readers the truth that _________? ? ? ? ? ??.
a. the most useless is usually the most useful
b. where there is a will, there is a way
c. one person's trash is another person's treasure
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