Smiling is the most attractive human behavior. The power of smiling can work out many wonders. I love to take a walk around the small neighborhood where I live. Whoever I meet on the way, they always give me a friendly greeting with a nice smile as soon as our eyes contact  1 . I smile back. This kind of smiling exchange represents the most   2  part of my jogging experience in the States.
My daughter's smile is just like sunlight, which warms me inside the same way   3   the sun warms my body. It can clear away any clouds and unpleasant feelings. The smile of my wife, however, makes me enjoy the   4  of an elegant woman, it can sometimes relax me quite a lot.
Julia Robert's    5  is nothing but roaring like an earthquake. Americans may have   6   opinions in many things, but they all agree that Julia is America's sweetheart. Her laugh plays a very good part in her acting. Once I tried some candy in a store, the owner asked me how sweet the candy is, I said sweeter than Julia Robert.   7  both of us broke into a kind of Julia's laugh. Yes, laugh is something we can not do without. Otherwise, our life would be too   8  .
Smiling does not belong to human alone. Once I stayed at an American home and he had a little dog named Mini. When I held her gently and asked her to give me a little smile,   9   just opened her mouth wide and half closed her eyes, looking like smiling.
Los Angles is not only the place where it has the most sunshine in a year,   10   where most people smile! That’s why so many people love to travel there all year round.

完形填空

　　After the Second World War, there were many reports of mysterious (神秘的) “flying saucers (碟子)”. They 1 throughout the world. For quite a long time strange shapes had been reported in 2 parts of the world, but it was not until recent times that these were seriously studied. Pictures and films 3 of flying saucers, or UFOs seen in the sky. Some pilots of 4 reported that round flying machines had followed 5 , and moved at great speeds. Some unofficial (非官方的) experts and 6 suggested that some creatures (生物) from other planets were watching us. Some reports said a UFO had 7 theearth. A space creature 8 the. UFO and moved around, then flew off again. But none of the landings was ever proved (被证实) to be true.

　　What lies ahead of us (我们的前景如何)? We do not know. 9 we can be sure that whatever happens, we are living in an age which will grow steadily (稳定地，逐渐地) 10 .

Do you know why different animals or insects have their special colors? Colors are used mainly to protect themselves.
Why can’t some birds easily catch locusts（蝗虫）? It is because locusts change their colors together with the change of the colors of crops. When crops are green, locusts look green. But as autumn comes, locusts change to the same brown color as crops have. Some other insects with different colors from plants are easily found and eaten by others. So they have to hide themselves for lives in the day and appear only at night.
If you study the animal life, you’ll find the main use of coloring is to protect themselves. Bears, lions and other animals can’t be easily seen by hunters. This is because they have the colors much like the trees.
Have you ever noticed an even more strange thing? A kind of fish in the sea can send out black liquid when it faces danger. While the liquid spreads over, its enemies can’t find it. And it quickly swims away. So it has lived up to now though it is not strong at all.
【小题1】 From the article we learn that locusts 　　　　　　　　　.