单项选择题

The author's main purpose in writing this passage is to ______.

A．discuss the negative effects of patenting genes
B．face possible moral consequences of patenting genes
C．condemn the selfishness of researchers who patent genes
D．weigh the advantages and disadvantages of patenting genes
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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.
单项选择题
Laying claim to DNA stretches can be careless genetics because ______.
A．those who patent gene fragments are not qualified geneticists
B．the same gene fragments are often patented by different scientists
C．geneticists have no idea what they are going to do with patented genes
D．some of the gene fragments patented contain no real genetic information
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