The key to reaching or staying at a healthy weight is regular exercise and good eating habits. Teens should get 60 minutes or more of physical activity a day. Note the word “activity”. As long as you’re getting your body moving, it doesn’t have to mean doing complicated exercises or going to the gym (体育馆) every day. All that matters is that each week you get the right balance of activity, including aerobic (有氧健身法的) strength building, and flexibility (柔韧性) exercise. Make exercise a habit by scheduling some every day.

On days when you have soccer practice or an aerobics class, you may have no trouble exercising for an hour or more. But most of us are busy, and 60 minutes a day of activity seems like a lot of time. The good news is that it’s OK to divide it into shorter “exercise breaks” throughout the day. Just as you might have a healthy snack to stop yourself getting hungry, exercise snacks can keep energy level high. So get up 15 minutes earlier and do some yoga or other stretching (伸展) activity. Fast walk or jog (慢跑) for 15 minutes at lunch. Do the same thing after school ??????????or walk or bike home. Add to that taking the stairs, gym class, and walking between classes during the day, and you’ve probably reached your 60 minutes.

Here are 5 simple ways to make an exercise lifestyle change:

1. Start today. Go outside for a walk.

2. Take the stairs instead of the elevator.

3. Instead of driving, walk or bike to places like school or a friend’s house.

4. Clean your room or wash the car.

5. Limit your time watching TV, using the computer, or playing video games--and when you do play, try some games that get you moving.

The underlined phrase “exercise snacks” in the second paragraph probably means ________.

A. food eaten before exercise

B. food eaten during exercise

C. shorter “exercise breaks”

D. a new kind of exercise

Why should we have exercise snacks every day?

A .Because they can stop us getting hungry

B. Because they can keep energy level high

C. Because they can include many kinds of sports

D. Because they are more likely to relate to our daily life

Which of the following is NOT mentioned in the passage?

A. To go hiking on your holidays

B. To spend less time on computer games

C. To go to school on foot or by bike

D. To do some housework at home

What will be most probably discussed in the following paragraph?

A. Losing weight   B. Good eating habits   C. Exercising your brain  D. Outdoors exercise

What would be the best title for this passage?

A. Regular exercise    B. School exercise    C. Indoors exercise    D. Difficult exercises

We have known for a long time that flowers of different plants open and close at different times of day. This is so    1    that there seems to be no need to ask the reason for it. Yet no one    2    understands why flowers open and close like this at particular times. The process is not as    3    as we might think, as recent experiments have shown. In one study, flowers were kept in constant    4   . We might expect that the flowers, without any information about the time of day, did not open as they    5    do. As a matter of fact, they    6    to open at their usual time. This suggests that they have some mysterious(神秘的) way of knowing the    7   . Their sense of time does not    8    information from the outside world; it is, so to speak, inside them, a kind of “inner clock”.

This    9    may not seem to be very important. However, it was later found that not just plants but also    10   , including man, have this “inner clock” which    11    the working of their bodies and influences their activities. Men, then, are also influenced by this mysterious    12   . Whether we wish it or not, it affects such things in our life as our need for sleep, our need for food.

In the past, this did not really    13    because people lived in natural condition. In the    14    world, things are different; now there are spacemen, airplane pilots and, in ordinary life, a lot of people who have to work at night. It would be very   15  , then, to know more about the “inner clock”. Such things as flowers might help us understand more about ourselves.

1.A. familiar       B. strange      C. similar          D. special

2.A. partly     B. personally       C. really           D. willingly

3.A. complex        B. simple           C. mature           D. meaningful

4.A. quietness      B. darkness     C. loneliness       D. sadness

5.A. finally        B. completely       C. physically       D. normally

6. A. refused       B. decided      C. continued        D. failed

7.A. time           B. secret           C. process      D. study

8.A. deal with      B. add to           C. give away        D. depend on

9.A. discovery  B. activity     C. invention        D. method

10.A. beasts        B. animals      C. strangers        D. humans

11.A. controls      B. studies          C. measures     D. destroys

12. A. world        B. flower           C. power            D. experiment

13.A. happen        B. exist            C. matter           D. work

14.A. ancient       B. modern       C. wonderful        D. peaceful

15.A. hard      B. expensive        C. convenient       D. important

D

In the 1960s, people asked about your astrological sign(星相). In the 1990s, they wanted to know your website (网址). These days, having a web address is almost as important as a street address. Your website is an electronic meeting place for your family, friends and potentially, millions of people around the world. Best of all, you may not have to spend a cent. The Web is filled with all kinds of free services and all it takes is some time and creativity.

Think of your home page as the starting point of your website. Like the table of contents of a book or a magazine, the home page is the front door. Your site can have one or more pages, depending on how you design it.

While web pages vary greatly in their design and content, most use a traditional magazine layout (版面设计). At the top of the page is a banner(大标题) GRAPHIC. Next comes a greeting and a short description of the site. Pictures, texts, and links to other websites follow.

Before you start building your site, do some planning. Think about whom the site is for and what you want to say. Next, gather up the material that you want to put on the site. Draw a rough layout on a sheet of paper.

While there are no rules you have to follow, there are a few things to keep in mind:

Start simply If you are too ambitious (雄心勃勃的) at the beginning, you may never get the site off the ground. You can always add to your site.

Less is better Most people don't like to read a lot of text online. Break it into small pieces.

Smaller is better Most people connect to the Internet with a modem (调制解调器). Since it can take a long time to download large image files, keep the file sizes small.

Have the rights Don't put any material on your site unless you are sure you can do it legally (合法地). Learn the Net's Copyright Article for more about this.

Now it's time to roll up your sleeves and start building. Learning the Net Communities provides tools to help you build your site.

68. The main purpose of the passage is to tell you _____.

A. what a website is like

B. how to build your own website

C. how to meet people online

D. what a website is made up of

69. According to the writer, your website is a place _____.

A. where you can meet people all around the world

B. where you can buy what you want

C. where you can get free services

D. where you can meet people on the Internet

70. The purpose of the home page of your website is _____.

A. to give a list of all the contents of your website

B. to make it look like a front door

C. to direct people to more of your pages

D. to design the cover of a book or magazine

71. The writer thinks that if you are too ambitious at the beginning, _____.

A. your website may leave no space for adding new things

B. you may never have your wetside working

C. you may have no idea how to build your website

D. you may tire yourself out

Please ______ the numbers and I’m sure they will ______ more than 1, 000.

A. add up; add to                                   B. add up; add up      

C. add up; add up to                                       D. add to; add up