单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．To discuss the second essay.
B．To get the comments on TV news.
C．To plan to join TV news programs.
D．To tell the difference of TV news.
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单项选择题
A．To remind the woman to lock the door when going out.B．To remind the man to take his keys when going out.C．To prevent the thief to break into when going out.D．To prevent visitors from having an accident.
A．To remind the woman to lock the door when going out.
B．To remind the man to take his keys when going out.
C．To prevent the thief to break into when going out.
D．To prevent visitors from having an accident.
单项选择题
A．Environment and genes.B．Cells of proteins.C．Genes of parents,D．A sequence of DNA.
A．Environment and genes.
B．Cells of proteins.
C．Genes of parents,
D．A sequence of DNA.
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