民法的平等原则主要体现在（）。A、商品交换的等价 B、民事主体平等的法律地位 C、民事主

用所给单词的正确形式填空。

1. My friends______ ( not play) football on Sunday.

2. He often______ ( swim) in the river every Sunday.

3. It's five o'clock now. Some people in London ______( run ) for trains.

4. —What are they doing?

    —They______ ( listen ) to music.

5. I can't _          ( speak) English , but I can write it.

6. Let's______ ( sweep) the classroom.

7. Yuanxiao______( bring) you good luck all the year round.

8. My mother and I______( clean) our living room now.

9. I want______( paint) my house white.

10. The boy______( watch) TV with his parents in the living room at the moment.

有二叉树如下图：

在该二叉树中查找关键码值200，需要进行 ______ 次关键码值比较。

A．1

B．2

C．3

D．4

牵引故障机动车使用软连接牵引装置时牵引车与被牵引车之间的距离有何规定？

朱砂的主要毒性成分为（）；蜈蚣的毒性成分为（）样物质及溶血蛋白质。

对于清洁刮痧部位的排列顺序，正确的一项是（）。

①用手按压纸巾或干毛巾上，吸收皮肤上残留的刮痧介质；

②将消过毒的纸巾或干毛巾铺展在刮痧（拭）部位上；

③单方向逐部位擦拭干净

A、②-①-③

B、①-②-③

C、①-③-②

D、②-③-①