利用一支尖头铅笔（如图所示），现场体验“压强与受力面积的关系”．

一个物体受到两个力的作用，如果两个力的三要素完全相同，那么这两个力是（   ）

生物的性状就是（　　）

作为首位获得诺贝尔科学奖的中国人，屠呦呦为世界抗疟事业做出了卓越贡献，她和她的团队研究的青蒿素是目前世界上消灭疟原虫（一种单细胞动物）最有效的药物．下列与疟原虫结构最相近的是（    ）

阅读理解
    Tom lives in the UK. His friend Jack is in Dubai. He will go to see his friend. First he needs to go to London to take the plane.
    On Friday morning, Tom takes a bus to the train station. It takes Tom about 30 minutes to get there. Tom gets on the train at about 10 o'clock：The train leaves at 10：15. The train trip to London takes three hours. At lunchtime Tom gets to London. Tom eats a hamburger for lunch. Then he goes to the airport(机场)by subway. After about one hour,Tom gets to the airport. Tom gets on the plane at 8 o'clock in the evening. The trip takes a long time. Tom is tired(疲倦的)after a busy day. So he goes to sleep(睡觉). On Saturday morning, Tom gets to Dubai. He is very happy, because he will have a great time with his friend.