在不使用示教器的时候，随便放置好示教器即可。
A. 对
B. 错
What is reported in the news?
A deadly fish has been spotted in the Mediterranean waters.
B. Invasive species are driving away certain native species.
C. The Mediterranean is a natural habitat of Devil Firefish.
D. Many people have been attacked by Devil Firefish.
What is the environmentalist concern about the spread of devil fire fish in the Mediterranean?
A. It could add to greenhouse emissions.
B. It could disrupt the food chains there.
C. It could pose a threat to other marine species.
D. It could badly pollute the surrounding waters.
What will happen on World-Car-Free-Day in Paris?
A. Cars will not be allowed to enter the city.
B. About half of its city center will be closed to cars.
C. Buses will be the only vehicles allowed on its streets.
D. Pedestrians will have free access to the city.
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