【推荐1】Everyone knows that good sleep is important, but not everyone knows how important it is     1     (sleep) in the dark. A new report said sleeping with the light on possibly increases the risk of     2     (get) some diseases. Even the light from a television or clock could be     3     (harm) to our health. The report also said that of different kinds of lights, the     4     (bad) to sleep with is a main light. Sleeping in the dark is more difficult for the people to live in cities, where there is a lot of outdoor light at night.

Spring Equinox (春分) is the     1     (第四) of the 24 solar term (节气). It’s on March 21 this year. On this day, day and night all over the world are equal length. After this day, daytime will     2     (持续) longer than night.

Spring Equinox means the most exciting days of spring have come. Spring is the best time for going outside and flying k    3     in China. There are also other traditions for this day, such as balancing (平衡) eggs. In some places, people paint the eggs in many colors and hold egg — balancing competitions. They think     4     (特别的) gravitational forces (引力) can help eggs stand on their ends. In fact, you can balance an egg on its end any day of the year, have a t    5     for fun.

Artificial (人造的) light is necessary in our modern society.     1     the increased use of lighting can     2     /kɔːz/ some problems. Light in the wrong place and at the wrong time can disturb us.

How to     3     /prɪˈvent/ light pollution? Before answering the question, please think of a few simple questions: Is the lighting necessary? Could safety or security be achieved by other     4     (way)? Do the lights have to be on all night? Will it matter if we turn them     5    ?

If lighting is the best choice, then only the right number of lights for the task should be installed (安装). Lighting will then become a problem if lights are poorly designed or incorrectly installed.

If lighting     6     necessary, a number of ways can be taken to stop causing harm: For a family,     7     150W lamp is enough. High power (300/500W) lamps can     8     /kriˈeɪt/ too much light. As we all know too much light is sometimes     9     (danger). It can make our     10     (eye) lose sight for a short time. For an all-night porch(走廊), a 9W lamp is OK in most situations.

Make sure that lights are correctly adjusted (调整) so that they only make the surface bright and do not throw light onto unnecessary places.

Is a computer cleverer than I am? The answer to this question is, for the time    1     “No”. Your brain can understand the meaning of things     2    and create new ideas. However, one day computers may be able to do     3    things that a human brain can do and do them better. They may be better than doctors, judges and teachers at     4    their jobs.

If this is true, it raises     5    questions. What will happen to us if computers can do     6    jobs? How will we spend our lives? Will we have nothing to do? Computers may change our lives. But will they make     7    better? How do we give a computer instruction?

We give a computer instructions by    8     a program into it. The program is    9    by a human being, and it is essential that the human does not make a mistake. If we want a computer to do different     10    , we have to give it different programs.