信息产业是国家经济的先导产业。这一作用体现在哪些方面？

已知：线段AB=5cm ，延长AB 到c ，使AC=7cm ，在AB 的反向延长线上取点D ，使BD=4BC ，设线段CD 的中点为E ，问线段AE 是线段CD 的几分之一?

在测定某液体密度时，有一同学测出了液体的体积、容器和液体的总质量。实验做了三次，记录如下：

　试求：

（1）液体的密度ρ；　　

（2）容器的质量m₀；　　

（3）表中的m'

下列关于资产流动性的说法，正确的有（）。

A．资产流动性反映了商业银行持有的资产在无损失或微小损失的情况下迅速变现的能力

B．资产的变现能力越强，所付成本越低，则流动性越强

C．计算资产流动性时应包括商业银行所持有的各类资产

D．一般从零售客户和公司/机构客户对商业银行的资产流动性进行分析

E．商业银行应当估算所持有的可迅速变现资产量，把流动性资产持有与预期的流动性需求进行比较，以确定流动性的适宜度

Having one of those days—or weeks—when everything seems to annoy you? Even if you do nothing about it, your bad mood(心情) will probably go away after some time. But with a little effort, you can forget it much faster—often within a day or two.

Walk it off

Exercise is the most popular bad­mood buster. A person who's in a bad mood has low energy and high tension. Taking a fast ten­minute walk, or doing some quick  exercises can do wonders towards changing the bad mood.

Tune it out

Listening to your favorite music for a while can also make tension go away quickly, because music starts connection with past positive experiences we've had.

Give yourself a pep talk

Stop and listen to what's on your mind. Bad moods are often started by too many negative thoughts. Write them all down on paper, the pessimistic(悲观的) messages you've been giving yourself, and then give optimistic answers. (“I still don't have a job.” vs “I have two interviews next week.”)

Reduce your stress

Relaxation techniques are wonderful mood­lifters. These include deep breathing, stretching and visualizing, all of which sound complicated(复杂的) but aren't. One easy way to visualize: close your eyes and picture a favorite place, such as the beach. Another simple way to distress is to make a to­do list. One reason for being in a bad mood is feeling you have no options. By taking control over certain areas,  you realize you're not helpless. You can make changes in your mood and life.

Avoid things that won't improve your mood

TV may not help much: you need to increase your energy level and stimulate(刺激) your mind—something that the TV show “Neighbors” won't do. And before you reach for that piece of cake and coffee, think about how mood and food are linked. Sugar and caffeine contribute to depressed moods. The better choice? Research shows that carbohydrates, such as potatoes and pasta(面食), produce calming effects in people who have a desire for them.

小题1:Which of the following may help us stop a bad mood?

A．Doing nothing about it.

B．Exercising and enjoying music.

C．Writing down negative thoughts.

D．Talking about it with neighbors.小题2:Why is it suggested that you close your eyes and picture the beach?

A．It helps remove bad mood.

B．It brings us a new technique.

C．It is not complicated to do so.

D．It is an area to be easily controlled.小题3:TV may not improve your mood because it ________.

A．shows what happens around you

B．does not energize you

C．reminds you of eating and drinking

D．produces a calming effect小题4:Which would be the best title for this passage?

A．Energy Level and Stress

B．How to Beat a Bad Mood

C．Bad Mood and Our Life

D．How to Control Your Feeling

根据我国民航有关规定，持成人飞机票乘坐经济舱的游客，每人的免费行李重量为( )。

A．40千克
B．30千克
C．20千克
D．10千克