单项选择题

The word "submarine" (Line 2,. Para. 3) is closest in meaning to "______".

A．careless
B．expensive
C．unsuspecting
D．hidden
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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
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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