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
According to the passage, what can scientists do now with the genetic testing technology
A．Prescreen a baby's sex.
B．Screen babies for desirable attributes.
C．Insert genes parents want.
D．Craft genes in a la
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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