We have always been interested in the moon. 2000 years ago people already knew it moved around the earth and where it would be in the sky at different times of the year. At that time, everything about the moon was learned by watching it carefully in the sky.

    When scientists could use telescopes to study the moon more closely, their ideas began to change. They could see the moon was made of rocks. Most scientists thought moon rocks would be different from those on Earth. This was because they believed the moon had once been a planet that had been caught in the earth's gravity (引力) millions of years earlier.

    In 1969 moon rocks were finally brought to the earth and studied. Much to their surprise, scientists found that, except for water, the moon and the earth were made of the same things. Once again new ideas were needed for this new information.

    After years of study, most scientists now think that the moon was once part of Earth. They believe very early in its history, maybe 4 million years ago, something about the size of Mars hit Earth. This sent billions of rocks into space around our planet. These rocks slowly joined together and after many years became the moon.

    However, in the future, even though our ideas about the moon may change again, we will still be interested in it.

    Today is December 15, 2030. Influenced by the launch of the first manned mission to Mars next month, you will most likely get a gift card for a space trip.

    The interest in trips, 100km above the surface of the Earth, has grown steadily since such a trip began. However, the market has grown much larger this year since the official announcement of the Mars mission. More low - cost spacelines have entered the market and you can now find flights for such a trip for as low as $3,495.It's very reasonable.

    Space tourism( 旅游业，观光业) is one of the markets that have developed fast during the last decade, with the opening of the Starbright Hotel on the moon as well as the low orbital hotels that started accepting guests. However, accommodation in space is still expensive for the average household, so the suborbital (亚轨道的) flights with thirty - minute weightlessness during the three - hour flight will for some time be the most popular trip.

    However, the spacelines might in the future face fierce competition between space elevators (太空升降舱), like the one that is projected to start construction within two years. Once it is fully functional, it will start to ship cargo to space. But it will accept passengers as soon as possible to get back the large investment. Even if the elevator becomes successful, it will take several years before there are more elevators in the world to get in the competition for space traffic with the spacelines.

    Those who are looking for a little bit of adventure and have extra money to spend may want to consider a suborbital flight in space. While a suborbital flight may not be the space mission that you have always dreamed of, it will give you the rare opportunity to see what our planet looks like in a high - altitude flight outside our atmosl3here. So before you enjoy a trip by elevator to space, enjoy a suborbital flight first.

    Hello. We are students from Thailand, and we want{#blank#}1{#/blank#}(save) the elephants. The elephant is one of Thailand's symbols. Our first flag{#blank#}2{#/blank#}(have) a white elephant on it. This is a symbol of good luck. Elephants{#blank#}3{#/blank#}(be) smart animals. They can play soccer or music. They can also{#blank#}4{#/blank#}(draw) very well. People say that "an elephant never{#blank#}5{#/blank#}(forget)". Elephants can walk for a long time and never get{#blank#}6{#/blank#}(lose). They can also remember places with food and water. This{#blank#}7{#/blank#}(help) them to live. But elephants are in great danger. People cut down many trees, so elephants{#blank#}8{#/blank#}(lose) their homes. People also kill elephants for their ivory. Today there are only about 3,000 elephants (over 100,000 before). We must save them and not buy things{#blank#}9{#/blank#}( make) of ivory. Let's{#blank#}10{#/blank#}(remember) that March 13th is Thai Elephant Day.

The robots are just like human servants. They help us do the housework and jobs {#blank#}1{#/blank#} working in dirty or dangerous places and doing simple jobs over {#blank#}2{#/blank#} over again. {#blank#}3{#/blank#} people will do such jobs in the future because they are boring， but robots will never get {#blank#}4{#/blank#}. 

 Scientists are now trying to {#blank#}5{#/blank#} robots look like people. Robot scientist James White thinks that it will be {#blank#}6{#/blank#} for a robot to think like a human. But other scientists disagree. They think that robots will be {#blank#}7{#/blank#} to talk like humans in 25 to 50 years. 

In {#blank#}8{#/blank#} of years， new robots will have many different shapes. Some will look like humans，and others might look like animals. If buildings {#blank#}9{#/blank#} down with people inside，the snake robots can help {#blank#}10{#/blank#} for people under the buildings. It seemed impossible 100 years ago. We never know what will happen in the future！