单项选择题


Questions 19 to 21 arc based on the conversation you have just heard.

A．He is a professional electrician.
B．He possesses a basic knowledge of electricity.
C．He knows nothing about electricity.
D．Electricity is his major.
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单项选择题
Why should the rooftop garden be built on the top of City Hall other than on any other buildings
A．Because the City Hall is large.
B．Because the mayor had urged the environmental department to do so.
C．Because it can make people understand their impact on environment better through a public building.
D．Because the experts just want to make the City Hall a convenient laboratory.
单项选择题
What CANNOT be inferred from the first paragraph
A．Scientific experiments in the past three hundred years have produced many valuable items.
B．For three hundred years there have been people holding a hostile attitude toward science.
C．Modem civilization depends on science so man supports scientific progress unanimously.
D．Some people think three hundred years is not long enough to set back for critical appraisal of scientific method.
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