单项选择题

A．She didn’’t go to work this morning.
B．She was injured and had to go to the hospital
C．She talked with the boss in the morning.
D．The traffic delayed her.
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单项选择题
According to the author, cats________.
A．are not domestic animals at all
B．are fiercer than dogs
C．are both meek and independent
D．can sometimes be very hostile to people
单项选择题
Among the following,________is not the symptom of lack in protein.
A．the baby will have a flaky paint skin
B．there will be something wrong with its bone
C．there is not enough melanin
D．the baby cannot produce important immune factors
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