单项选择题


A．poor
B．ideal
C．average
D．disappointed
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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
A．butB．exceptC．withD．besides
A．but
B．except
C．with
D．besides
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