五指并拢时手掌的面积占全身体表面积的比例是
A．1%
B．2%
C．3%
D．4%
E．10%
参考答案：A
Why not _______your best _______ people in need?
A．to try; to help
B．try; help
C．try; helping
D．try; to help
-3，-2， 1， 6， ( )
A．8
B．11
C．13
D．15
