单项选择题

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

A．He can’t afford to buy the ticket.
B．He needs a break from the math problem.
C．He doesn’t want to go to the opera.
D．He’ll meet the woman when he has finished the math problem.
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填空题
Union workers elect their representatives to make up ______ system to work with trade union officials.
单项选择题
Which of the following is true about the expressed sequence tags
A．They are difficult to mark off.
B．They contain unidentified genetic information.
C．They contain the entire human genetic information.
D．They are genes whose specific functions have been identified.
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