单项选择题

What is gene therapy supposed to do to live up to its promise

A．Screen a baby for sex.
B．Remove undesirable attributes.
C．Implant genes.
D．Identify genetic disorder.
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单项选择题
From the passage we know that ______.
A．designing babies may bring people a lot of ethical concerns
B．designing babies is purely scientific not to cause ethical problems
C．the prospect of designing babies has caused criticism from communities
D．people are concerned about the harm done to science by designing babies
单项选择题
What does dust-jacket in the first paragraph probably mean
A．The title of a book.
B．A kind of cloth.
C．Book cover full of dust.
D．Protecting paper cover of a book.
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