医生：病人
A．园丁：花朵
B．父母：子女
C．青蛙：庄稼
D．啄木鸟：害虫
参考答案：C
解析： 医生可以治好病人的病，青蛙可以治好庄稼的病，故选C。
The margin plate is the（）.
A.outboard strake of plating on each side of an innerbottom
B.outer strake of plating on each side of the main deck of a vessel
C.plate which sits atop the center vertical keel
D.uppermost continuous strake of plating on the shell of a vessel
