They just enjoy ______ together.
A. be
B. to be
C. being
D. to being
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Mom always ______,"Love is mutual respect, love is a trust, love is also a responsibility."
A. say
B. says
C. said
D. to say
o光在晶体中的折射率是各向同性的。()
A. 对
B. 错
我国目前使用的普通混凝土枕分为Ⅰ、Ⅱ、Ⅲ型,Ⅰ、Ⅱ型枕长度均为()m。
A. 2.3
B. 2.4
C. 2.5
D. 2.6
某瘫痪病人的肢体可在床上水平移动,但不能抬离床面,估计其肌力为( )
A. 0级
B. 1级
C. 2级
D. 3级
E. 4级