B

    Are you sorry for not traveling during the National Day? If you stay a t home at that time, I think you are very lucky. Why? Because there are too many people everywhere. In many places of interest in China, it's too crowded to do anything.

    It was very crowded in the West Lake on October 1st, 2013. You even couldn't take photos for you or your friends. All what we could see were people. It was reported that there were about 13 people per meter by the lake. My friends told me they could see nothing but many tourists(游客) on the Broken Bridge(断桥). "We couldn't walk if the people in front of us didn't walk," he said. He showed us a photo near the West Lake. In the photo, we hardly found him out, there were too many people.

    So some people give the advice that we should not have the gold week(黄金周) any more. But other people say no about this advice. What's your idea of it? Are you sorry now for not traveling during the gold week? I love staying at home more than traveling next National Day.

肺动脉里流动的是动脉血．（判断对错）

 已知：2KMnO_4​K₂MnO₄+MnO₂+O₂↑．下列图象表示一定质量的KMnO₄受热过程中某些量随时间的变化趋势，其中正确的是（　　）