单项选择题

From the passage we know that "the greenhouse effect" is an effect in which ______.

A．low temperatures are created by using a house
B．the house is made green in order to keep heat
C．heat is prevented from escaping outside
D．everything is kept green in a house
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单项选择题
Which of the following consists of three words that refer exactly to the same thing in the passage
A．Climate, temperature, heat.
B．Carbon dioxide, the gas, atmosphere.
C．Output, production, effect.
D．Termites, critters, insects.
单项选择题
It can be seen from the passage that in the second stage ______.
A．some traditional goods and services were not successful when provided by the home economy
B．the market economy provided new goods and services never produced by the home economy
C．producing traditional goods at home became socially unaceeptable
D．whether new goods and services were produced by the home economy became irrelevant
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