M: Now we have satellite and high-powered microscope, it’s easy to think we know everything about the world; but we still don’t understand EI Nino.
W: Right. Scientists all over the world over are even uncertain about the cause of the warm Pacific current that brings storms or drought—the mysterious EI Nino.
Q: Which of the following is true according to the conversation?
M: Everyone is talking about environmental problem: acid rain, the greenhouse effect, holes in theozone layer. We should think positively. What can we do to improve things?
W: I agree. We could do a lot more to harness the sun’s energy for heating and lighting in our homes. In Japan 43,000 solar roofs were installed in 2002.
Q: How do the man and the woman view the environment?
W: We lived in Beijing some years ago. It was always difficult to keep the house clean with wind from the north blowing sand from the desert at us.
M: That’s why the Chinese government has been encouraging people to plant trees along the edges of the Gobi Desert. Now those trees act as wind barriers.
Q: What did the government encourage people to do?
M: Many old refrigerators and cars are environmental hazards because they contain CFCs that destroy the ozone layer.
W: Yes, but government or organizations are helping people to safely dispose of old refrigerators or, in the case of cars, to upgrade their air conditioning.
Q: What are government departments helping people to do?
M: Hey, that’s an aerosol s