His sister ______ kind to her neighbors. [ ]
A. am
B. are
C. is
D. be
答案：C
麻疹的病变主要在
A．肺脾B．心脾C．脾胃D．肺肝E．肺卫
由松散的沉积物变为坚硬的沉积岩的过程称（）作用。
A、风化
B、成岩
C、沉积
D、压实
