单项选择题

A．great
B．plenty
C．many
D．some
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单项选择题
A．spotlessB．pointedC．woundedD．completed
A．spotless
B．pointed
C．wounded
D．completed
单项选择题
Biotechnology enables us ______.
A．to change the DNA of human beings
B．to produce more milk by increasing the number of cows
C．to increase the functions of various cells and organisms
D．to find new human molecules
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