The little boy was on the ______ of tears when his teacher asked him what he had done.
A. verge
B. fringe
C. margin
D. rim
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肝硬化腹水病人进水量应限制在每日( )
A. 400ml
B. 600ml
C. 800ml
D. 1000ml
E. 1200ml
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
不可抗力发生后，承包人应在力所能及的条件下迅速采取措施，尽可能减少损失，并在不可抗力事件发生过程中，每隔( )向工程师报告一次受害情况。
A. 4d
B. 5d
C. 7d
D. 8d
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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