单项选择题

A．Watch traffic.
B．Obey commands.
C．Cross streets safely.
D．Guard the door.
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单项选择题
The reason why studying the nature of human beings is popular is that.
A．the scale and scope of it is unprecedented
B．it is useful for determining policy
C．it is still an area of great mystery
D．there are so many best selling books about it
单项选择题
A．4 yearsB．5 yearsC．8 yearsD．at least 9 years
A．4 years
B．5 years
C．8 years
D．at least 9 years
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