下列各种摩擦中，属于有益摩擦的是（　　）

下面关于血液各种成分的叙述中，错误的是（  ）

参考词汇： have a good rest, get up early, see my grandparents, go to the cinema, play table tennis, have a picnic, help with the housework, watch TV, do my homework

注：1、开头已给出，不计入总数。2、所给词必须用上，可以适当拓展。

My May Day holiday plan

    May Day is coming soon. We will have a 3-day holiday.……

    Today it is found that school students hardly pay much attention to sports. Is it because they aren't interested in sports? No. They often say they have other more important things to do.

    What are these important things? Examinations! Students have to spend much time on all kinds of examinations at school. So many of them almost become bookworms (书呆子). Books stop them from doing sports. Because of the pressure from their parents and teachers, the students have to work harder and spend most of their time on books. As for (就……而言) the students, they want to get good results so that they can improve their studies. So it is necessary（必要） for them to give all of their free time to their studies and stop their school sports.

    In fact, education can't go without physical (身体的) exercises, because a quick mind hardly goes along with a weak body. If you don't have a strong body, you can never get anything, let alone (更不用说) a great success in your life.