问题 填空题

(8分) (1)如图1所示,把一块洁净的玻璃板吊在橡皮筋下端,使玻璃板水平接触水面.如果你想使玻璃板离开水面,必须用比玻璃板重力________的拉力向上拉橡皮筋,原因是水分子和玻璃的分子间存在________________________作用.

(2)往一杯清水中滴入一滴红墨水,一段时间后,整杯水都变成了红色,这一现象在物理学中称为__________现象,是由于分子的____________而产生的,这一过程是沿着分子热运动的无序性__________的方向进行的.

答案

(1)大 引力 (2)扩散 热运动 增大

(1)玻璃板接触水面,水分子与玻璃分子间存在相互作用力,将玻璃板向上提

时,分子间表现为引力,故此时所需向上的拉力比玻璃板的重力大.

(2)红墨水滴入水杯中后,由于扩散作用,一会儿整杯水都变成红色.扩散是分子的

热运动造成的.根据热力学第二定律,一切自然过程总是沿着分子热运动的无序性

增大的方向进行的.

选择题
阅读理解

阅读下列材料,从所给的六个选项(A、B、C、D、E、F)中,选出符合各小题要求的最佳选项。选项中有一项是多余选项。

A. School or work

B. Make small talks

C. Be fun to be around

D. Be reliable

E. Get out and meet people

F. Join people of common interests

In the world, many people want to make friends just as you do. Follow these steps to meet new people and build strong, lasting friendships with at least some of them. The following paragraphs are some steps.

小题1:      . You don’t necessarily have to have a lot of common interests with people in order to make friends with them—in fact, some of the most rewarding friendships are between two people who don’t have much in common at all, but if you have something in common with people, it can make it a lot easier to talk to them. Whatever your age and whatever your interests, there is a club or an organization for you.

小题2:      . Friends can talk about just anything, but you don’t want to get too personal when you first meet someone. Just make good, small talks at first.

小题3:      . You don’t have to be a superstar to be fun. You do need to be positive and friendly, however, so that people feel good when they’re around you. From the very first conversation you have with someone, you should use body language. Smile frequently, laugh often, and make eye contact. In your words, be confident.

小题4:      .The steps above are great for making acquaintances (认识的人), but how do acquaintances become lifelong friends? One important feature of a good friend is reliability. When you say you’ll do something, do it. Be someone that people know that they can depend on.

小题5:      . If you want to make friends, you first need to meet people. No matter where you live, this should be very easy.