问题 实验题

小明同学在探究“阻力对物体运动的影响”的实验中,利用如图所示的实验装置,用同一辆小车分别从同一斜面的       高度(选填“相同”或“不同”)由静止滑下,用秒表分别测量小车在三种粗糙程度不同的材料表面运动的时间。当小车在木板面上运动时,小明利用秒表测量的时间如图所示,为      s,则小车在毛巾面上运动的时间会    (选填“更长”、“更短”或“相等”)

答案

相同   4

题目分析:根据控制变量法的要求,小车下滑时的速度应该是相同的,所以应使下滑的高度相同;秒表的小表盘示数为0,所以应读大表盘的示数,且是图中黑色的数值,其结果为4s;毛巾比木板更粗糙,所以其阻力更大,阻力越大,小车运动的时间就会越短.

点评:保持小车下滑速度相同,是控制变量法的需要;秒表的正确读数是我们应该掌握的基本实验技能之一

完形填空

Friendsh ip is a very important human relationship and everyone needs good friends.  Good friendship has many benefits.  It offers companionship, improves self-worth and promotes health.

There are times in our lives such as when we have recently moved into a new town, or  changed our jobs or schools.Such changes often leave us without a friend.____ 小题1:___.But for many of us the process is difficult and requires courage.  Below are some helpful suggestions  on how to make and keep friends.

1. Associate with others. 

The first step to making friends is associating with people.  You can go to public places to meet new people.  Besides, you will need to make yourself known by becoming an active member of such places.

2. Start a conversation

Starting a conversation is the second most important step in making new friends.__ 小题2:____.

You can always start the conversation.  Being able to make small talk is a very useful skill in relating with other people.  

3.____ 小题3:____

Choosing friends with common interests is important in building friendship as these interests

would always bring you and your friend together. Hanging out will always be a pleasant experience.

4. Let it grow. 

It is a good thing to stay in touch.  However, try not to press your new friend with calls, messages or visits as this would likely wear him or her out and finally you may lose your friend.   __小题4:_____.   The best friendships are the ones that grow naturally.

5. Enjoy your friendship

The best way to enjoy your friendship is to allow your friends to be themselves.____ 小题5:_.Try not

to change them from who they are to what you want them to be.  Become the kind of friend you will

want your friend to be to you. 

A.Be cheerful.

B.Do things together.

C.Do not wait to be spoken to.

D.Try not to find fault with your friendsE. Making new friends comes easy for some people.

F. For a friendship to develop you need to stay in touch.

G. So you will need to give your friend time to react(做出反应)to you.

单项选择题