阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项。
A
We all know that theme parks are places to have fun and amuse ourselves, but among so many exciting rides there are also some dangers.Make sure you know what the safety standards are for all the attractions at the park.If you do that, you will be safe and have fun.
Drink water. Believe it or not, dehydration—when your body doesn't have enough water—is the commonest cause of injuries at theme parks.Drinking water while you are at the park is not enough.You must make sure that you drink enough water before you visit it.
Use your “common sense”. There are lots of people around, so make sure you know where your friends or family are.Also, if you are walking and want to stop, make sure nobody is walking behind you.First step aside, then look behind and if you aren't in anybody's way, then stop.It might sound upset, but crashes between people can cause accidents.
Follow the instructions. The majority of theme parks have instructions for each ride.Some rides only allow people of a certain height.So make sure you are not too tall or too short before boarding any ride.Also, people with certain diseases or conditions are advised not to go on some rides.Do remember: If you are told not to go on a ride, then DON'T.
Do not ride with a bad stomach or if you've just eaten. Rides can make you ill because of their violent changes of direction and your lunch may end up on someone else's head; surely not a very pleasant experience.
Have fun, relax and be a little brave! Some rides might look scary but theme parks are very safe places.
文章大意：本文是一篇说明文。讲述了在主题公园玩时的注意事项。
21．What does the underlined word “dehydration” in Paragraph 2 mean？ B
A．Drinking too much water.
B．Losing too much water from one's body.
C．Losing too much food from one's body.
D．Having too much food.
解析：词义猜测题。根据第二段第一个破折号后“when your body doesn't have enough water”可知B为正确选项。故选B。
22．What is the leading reason for injuries at theme parks? B
A．Snow. B．Dehydration.
C．Fire. D．Crashes.
解析：细节理解题。根据第二段“Believe it or not, dehydration...is the commonest cause of injuries at theme parks.”可知B为正确选项。故选B。
23．According to the author B .
A．it costs nothing to go to theme parks
B．people can have lots of fun in theme parks
C．men are more interested in theme parks than women
D．shy people should not go to theme parks
解析：细节理解题。A、C、D三项在文中没有提到。根据第一段第一句，可知B项正确。故选B。
