题目列表(包括答案和解析)
，其中
是自然常数，
[
时, 
的单调性、极值；
;
，使的最小值是3，若存在，求出的值；若不存在，说明理由.阅读短文，根据其内容回答问题。
Self-images are our own mind’s pictures of ourselves. These images（意象）include the way we look, the way we act, the way we talk and the way we think. When we find that believing in ourselves is a bit hard, it is time we build positive（积极的）self-images and learn to have happy lives.
Interestingly, our self-images are often quite different from the images others hold about us. Unluckily, most of these images are more negative（消极的）than they should be. Thus changing the way we think about ourselves is the key to change our self-images and our whole world.
The best way to destroy a passive（被动的）self-image is to step back and decide to pay attention to our successes. That is, make a list if we need to, but write down all of the great things we do every day. Don’t allow doubts to happen on us.
It very well might be that we are experiencing negative self-images because we can’t move past the weakness that we see about ourselves. Well, make a change of it as our primary tasks. If we think we’re silly because we aren’t good at math, find someone to help us. If we think we’re weak because we can’t run a mile, get more practice. But remember, what we think doesn’t mean it’s true.
The best way to get rid of a negative self-image is to realize that our images are far from the goals, and to actively make ourselves believe that we have positive personalities. Changing the way we think and working on those we need to improve will go a long way to create new positive self-images. When we can pat ourselves on the back, we’ll know we’re well on our way.
64. What are self-images?
65. When do we need to build positive self-images?
66. What’s the key to change our self-images?
67. How can we destroy passive self-images?
68. What does the writer mainly want to tell us?
阅读短文，根据其内容回答问题．
Everyone knows the advantages of using email．It's much faster than ordinary mail．It's much cheaper than the telephone．However, it is not always good to use email at work．
One reason is that email is only one-way．You send out your message and then you have to wait for an answer．This is not a problem if you need to send simple information．But if the message is more complicated, email is not so good．In that case, it's better to talk on the phone．Or, if you're in the same building, you should go meet in person．Then you can also take a little walk and you can get to know each other better．
There is another problem with email：You don't get much information from the message．You have only the words themselves．This doesn't matter if the messages is just about facts or if it is not important．But it might cause trouble if the message is about something important．You can't tell much about the person who sent the message．You have no idea what she was thinking or feeling．You may put your own feelings into the message．And this can lead to communication problems in a company．
In England, psychologists(心理学家)did some research about using email at work．They studied office workers opening their email．The psychologists measured the blood pressure(血压)of the workers．They found that blood pressure went up if the messages seemed angry or negative(消极的)．It also went up if the messages were from the boss．It went up the highest when the messages were both negative and from the boss．
The psychologists said that people should be careful how they use email at work, especially shoes with jobs in a company．Their messages can easily hurt or upset(使心烦)people．So never send important news by email．Try to meet face to face with the person．Then everyone will understand each other better and will work together better．
1．Is it a problem to send simple messages by email?
2．What was the psychologists' research about?
3．When did the office workers' blood pressure go up the highest?
4．Why should people be careful about using email according to the psychologists?
5．What does the writer mainly tell us in the passage?
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