单项选择题


A．criticized
B．responsible
C．innocent
D．dismissed
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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
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
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