单项选择题

Why are some children still backward in speaking

A．Their brains have been input with too much language at once.
B．They do not listen carefully to their mothers.
C．Their mothers are not intelligent enough to help them.
D．Their mothers do not respond to their attempts to speak.
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单项选择题
How many of those trial implants fail to survive
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B．276.
C．19.
D．4.
单项选择题
Why are many women dissatisfied with marriage and the nuclear family
A．Because they want to stay home and do the housework.
B．Because they do not have enough money.
C．Because they have too much work and not much free time.
D．Because they do not have enough power in the family.
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