One possibility is the behavior of the sun. Astronomers at one research station have studied the hot spots and “cold” spots，that is，the relatively less hot spots, on the sun. This seems to have a greater effect on the distribution of the earth's atmospheric pressure, and consequently on wind circulation(循环). The sun is also variable(可变的) over a long term.Its heat output(输出)goes up and down in cycles. The latest trend being downward is on the way. But that is only an imagination.

　　6. The carbon dioxide in the atmosphere would________.

　　A. prevent the sun's rays from reaching the earth's surface

　　B. mean a warming up in the Arctic

　　C. account for great changes in the climate

　　D. raise the temperature of the earth's surface

　　7. The article was written to explain________.

　　A. the greenhouse effect

　　B. the solar effects on the earth

　　C. the solar weather

　　D. the causes affecting weather

　　8. Although the fuel is greater in the northern part，temperatures there seem to be falling.This is ________.

　　A．mainly because the carbon dioxide is rising

　　B．possibly because the ice caps in the poles are melting

　　C．due to the effect of the earth's climate

　　D．partly due to the activity of the sun

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