按行业标准规定，遇有（）以上的强风、浓雾等恶劣天气，不得进行露天攀登与悬空高处作业。
A．5级
B．6级
C．7级
参考答案：B
红色的光照到绿色的衣服上，是什么颜色？说明原因．
The bus was crowded with passengers going home from market, most of ________ carrying heavy bags and baskets full of fruit and vegetables they had bought there.
A．whom
B．them
C．who
D．which
