单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．They can’t get through to David.
B．David has been busy recently.
C．They are going to invite David to see a film.
D．They want to see the film without David.
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单项选择题
A disadvantage of fluid measuring is that ______.
A．fluid saturation of rocks can be caused by changes other than strain
B．present scientific instruments are not able to provide precise measurement
C．the electrical properties of the rock itself also change, the fluid capacity of rocks
D．fractures in these rocks are often so serious that accurate measurement is impossible
单项选择题
By implementing criminal prohibition, the government will be able to ______.
A．limit the development of technology in certain fields
B．ban human cloning in developing counties
C．establish more environment-friendly nuclear power plants
D．cut down high-tech crimes which have been prevailing nowadays
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