—
A:Yes, I do.
B:No, he doesn’t.
C:Yes, there is.
习惯上划分东西半球的分界线是( )
— How was your stay in Hong Kong?
—________. And it was a pity that I couldn't stay there longer.
某中学开展“关爱母亲河”综合实践活动。活动小组通过数据分析、实地考察、活动总结等活动,对黄土高原的水土流失问题进行调查研究。