C
    The ancient city of Chichen Itza in southern Mexico was one of the most powerful cities and one of the most powerful ancient cultures-the Maya．But today, no one lives there．It is only a group of old buildings．However, people from around the world still come to see it．People come to learn about its ancient culture, the culture of the Mayan people．
    The Mayan culture began almost 3,000 years ago and grew in parts of Central America．But a-bout l,000 years ago a group called the Itza invaded the city and built new parts of the city． based on natural wells．They named the city Chichen Itza, which means "mouth of the well of the Itza"．
    The most interesting structure in Chichen Itza is the Pyramid of Kukulcan（库库尔坎金字塔）,
whose four sides all come together at one point at the top．Each side on the Pyramid of Kukulcan has 91 steps．And there is one more step at the top of the pyramid．The steps are as many as the days of a year．Some experts believe the Maya could have used t．his building to help them know when to plant crops．Each day the sun falls on a different step of the pyramid, which could be a way to follow the year．
The people of Chichen Itza especially designed one building to observe and study the movement of the stars and planets．Experts say that the observatory（天文台） is one of the most complex structures the Maya built．A set of steps went up and around the observatory tower．And there were windows in the tower． Each window had a purpose．Experts believe that a person looking through one of these windows could see particular stars on particular dates．The Maya might have believed that studying the stars could tell them the future．
    Chichen Itza is now a UNESCO World Heritage Site and an important part of the world' s history．
28．Visitors came to the city of Chichen Itza to             ．
A．view its beautiful scenery           
B．experience and explore the Mayan culture
C．study and observe other stars on the observatory 
D．learn something about when to plant crops
29．Why did the invaders name the city "mouth of the well of the Itza" ?
A．Because wells can be seen in or around the city．  
B．Because it is large in size．
C．Because the city is newly-built．                  
D．Because its location is vital．
30．Which of the following is true?
    A．Chichen Itza is one of the World Heritages．
    B．The Pyramid of Kukulcan has 364 steps．
    C．Windows in the tower predict the weather in the future．
    D．The city of Chichen Itza has a long history of 3000 years．
31．What' s the author' s purpose in writing this passage?
    A．To evaluate the Mayan culture．
    B．To persuade readers to pay a visit．
    C．To introduce the ancient city of Chichen Itza．
    D．To present the development of the Mayan construction．
D
    Sunstroke is a condition that can quickly go from dangerous to deadly, especially if proper care isn’t given immediately．
    Sunstroke ,  sometimes called heatstroke,  is a result of the body temperature rising above safe limits．This causes the body's necessary functions to stop working．
    It's usually pretty easy to avoid sunstroke, as long as proper action is taken．In that case, you need to act as quickly as possible to return that person's body to a safe temperature． Here are a few tips to help treat sunstroke．
    Call for help
    Call to get an ambulance as quickly as possible．This should be the first thing you do, especially if the sunstroked person has fainted（昏迷）．Also, call for help from anyone nearby if you' re in a public place．If there's no one around, call someone nearby if they can get there sooner than an ambulance． Ask everyone to bring you as much water as possible, if there isn't much nearby．
    Get the person to a cooler area
    If there's a building nearby, aim for that．Anywhere with plenty of air conditioning and water is perfect．If a building isn't available, bring the person to a well shaded area．
    Get the water flowing                                                                         
    If the person is still conscious,  get him or her to drink water．If there' s a bathtub available, fill it with cool water and put．the person in it．
    If your water supply is limited, you have to save it． Dampen a towel or shirt and put it on the person's body．Focus on the face, neck, and chest．
    Fan the person
    Getting moving air over the person cools him or her down．Use anything, a towel or sheet, a shirt,  your hands, or a piece of board．This is where having many people around really helps, as they can combine to fan the entire body．
32．When does a person get sunstroked?
    A．when the body doesn't function．
    B．when proper care is given immediately．
    C．when someone is exposed to the sun too long．
    D．when the body temperature goes up beyond what one can bear．
33．What is mainly discussed in the passage?
    A．The first aid for sunstroke．         B．The cause of sunstroke．
 C．The chief symptoms of sunstroke．     D．The essential preventions of sunstroke．
34．Which of the following is NOT mentioned in the text?
    A．to call for assistance from others．      B．to leave the sunstroked person in the shade．
    C．to apply a wet towel to the person's face．   D．to help the person take some medicine．
35．The text probably comes from
   A．a guide book     B．a book review
   C．a medical magazine   D．an official document
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