单项选择题

A．Because they are busy serving food to their children.
B．Because they are busy keeping order at the dinner table.
C．Because they have to pay more attention to younger children.
D．Because they are tired out having prepared food for the whole family.
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单项选择题
A．There’s much to do besides work and study.B．It’s convenient for people to go anywhere.C．The natural environment is beneficial to children.D．The countryside is a perfect place for weekends.
A．There’s much to do besides work and study.
B．It’s convenient for people to go anywhere.
C．The natural environment is beneficial to children.
D．The countryside is a perfect place for weekends.
单项选择题
A．He was first of all a scientist.B．He was a naturalist but not a scientist.C．He was no more than a born naturalist.D．He was a scientist as well as a naturalist.
A．He was first of all a scientist.
B．He was a naturalist but not a scientist.
C．He was no more than a born naturalist.
D．He was a scientist as well as a naturalist.
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