单项选择题

A．She gave him his dollar back.
B．Two quarters and a half dollar.
C．Two quarters and fifty pennies.
D．Three quarters , two dimes and a nickel.
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单项选择题
It can be inferred from the passage that ________.
A．there will inevitably be a heated debate over the general application of the recombinant DNA technology
B．the use of recombinant DNA technology on human beings will be forbidden
C．recombinant DNA technology can be traced back to hundreds of years ago
D．serious dilemmas may be created when recombinant DNA technology is used to modify human genetic codes
单项选择题
Libraries are getting bigger and this can be dangerous for programming languages.
A．Y
B．N
C．NG
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