单项选择题

What best expresses Jeremy Rifkin's attitude toward designing babies through gene therapy

A．Strongly supportive.
B．Cautiously welcome.
C．Uncommitted.
D．Critical.
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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.
单项选择题
The author thinks that the service of the bookshop assistant is needed ______.
A．as soon as you enter the shop
B．before you start your browsing
C．only when you have finished your browsing
D．after you have made your final decision
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