1. What's people's usual reaction when they see a person throw a cigarette butt?
a. It varies.
b. He is to blame.
c. It causes them to smoke.


2. Filters can be made into a material that _________? ? ? ? ? ? ? ?.
a. can be turned into electricity
b. is used as the battery surface
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. where there is a will, there is a way
b. one person's trash is another person's treasure
c. the most useless is usually the most useful


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