单项选择题
Diffusion is the spontaneous spreading of matter caused by the
random
movement of molecules.
A．pattern1ess
B．whirling
C．constant
D．rampant
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单项选择题
The scientists developed their cloning technique to make it easier for childless couples to have babies by in vivo fertilization.
A． Right
B． Wrong
C． Not mentioned
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单项选择题
After the egg is fertilized the nucleus begins dividing.
A． Right
B． Wrong
C． Not mentioned
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