正常情况下，小儿颈曲形成的时间是( )
A．7个月
B．6个月
C．4个月
D．3个月
E．2个月
参考答案：D
______ he is only 8 years old, he knows more about science than his father.[ ]
A. But
B. Though
C. So
D. Because
京杭大运河数段中最早开凿的是( )。
A．永济渠
B．通济渠
C．邗沟
D．江南河
