单项选择题

What did the idea of public work projects help during economic depression

A．To prevent or control depression.
B．Creating job opportunities.
C．To aid business to revive.
D．All the above.
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单项选择题
A．constitutingB．aggravatingC．observingD．justifying
A．constituting
B．aggravating
C．observing
D．justifying
单项选择题
Why is it more likely for some families to produce fraternal(异卵双生)twins
A．There is a tradition in the family.
B．There is a secret diet in the family.
C．There is a hereditary tendency in the family.
D．There is a special way in the family.
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