下列实验能够直接用于验证质量守恒定律的是[ ]
A.
B.
C.
D.
答案：B
A park will be built ________ those who died in the big natural disaster in
this city. [ ]
A. in favor of
B. in face of
C. in honour of
D. in search of
女子最早参加奥运会比赛是在哪一届？（）
A.第1届
B.第2届
C.第3届
D.第4届
