Il mange des fruit riches _____ vitamines.
A．de
B．avec
C．en
D．pour
参考答案：C
Fangfang is a good student. She ___________ maths.[ ]
A. does good at
B. well do it
C. do well in
D. is good at
DNA的分子结构是[ ]
A．立体螺旋形梯子状
B．六边形
C．平面梯子状
D．“X”或“Y”形
