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 lab.
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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.
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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