单项选择题


Passage One
Questions 26 to 28 are based on the passage you have just heard.

A．Seventy percent.
B．Eighty percent.
C．Ninety percent.
D．Ninety-five percent..
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单项选择题
A．The Net is not healthy for people.B．The Net does not help with people’s communication.C．The Net is healthier than TV.D．The Net does no good to people’s psychological well-being.
A．The Net is not healthy for people.
B．The Net does not help with people’s communication.
C．The Net is healthier than TV.
D．The Net does no good to people’s psychological well-being.
单项选择题
What is the principal constituent of natural gas
A．Carbon and hydrogen.
B．Methane and other hydrocarbon gases.
C．Saturated hydrocarbons.
D．Non-associated gas.
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