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The old Olympic Games began around the year 776 BC in Greece．Many of the sports  1 the same as they are now．But then women were not  2  to take part in the games．  

The first Olympic Games in modem times happened in 1896．They were  3  in Greece，where the games were born．Both the Summer and Winter Olympics are held every four year．The Winter Olympics are usually held two years  4  the Summer Olympics．

The 24th Summer Olympics were held in 1988 in Los Angeles（洛杉磯）．The competitors from the People’s Republic of China  5  the games for the first time．The Chinese competitors 6  many medals since then．But most of the medals were won by women．We hope men will 7 their best to win more medals．

（    ）1．A．looked            B．had                      C．did                        D．were

（    ）2．A．a(chǎn)llowed          B．hoped                  C．prepared                D．a(chǎn)greed

（    ）3．A．held               B．began                  C．begin                     D．hold

（    ）4．A．in front of         B．later                     C．before                    D．earlier

（    ）5．A．took part in       B．went to                C．played with            D．joined

（    ）6．A．have won         B．a(chǎn)re winning            C．had won                 D．won

（    ）7．A．work              B．train                    C．compete                 D．do

　　The 24th Summer Olympics were held in 1988 in Los Angeles（洛杉磯）. The competitors from the People's Republic of China __(7)__ the games for the first time. The Chinese competitors __(8)__ many medals since then. __(9)__ most of the medals were won by women. We hope men will __(10)__ their best to win more medals.

A teacher began his class by holding up a glass with some water in it.  He held it up for all to see, and asked the students, " How much do you think this glass weighs?"

"50 g!" "100 g!" "125 g!" the students answered.

        "I really don't know unless I weigh it," said the teacher, "but my question is what would happen if I held it up like this for a few minutes?"

" Nothing! " the students said.

"OK. What would happen if I held it up like this for an hour?" the teacher asked.

"Your arm would begin to ache," said one of the students.

"You're right.  Now, what would happen if I held it for a day?"

"Your arm could go numb. Have to go to hospital for sure!" said another student. All the students laughed.

"Very good. But during all this, did the weight of the glass change?" asked the teacher.

"No." the students said.

"Then what caused the arm ache and the muscle (肌肉) stress?"

The students fell silent for a moment.

"Put the glass down!" said one of the students.

"Exactly!" said the teacher. "The problems of life are something like this. Hold them for a few minutes in your head, and it seems OK. Think of them for a long time and they begin to make you ache. Hold them even longer and you will not be able to do anything. It's important to think of the  challenges(挑戰(zhàn))  in your life, but it' s even more important to put them down at the end of every day before you go to sleep. That way, you are not stressed. You wake up fresh and strong and can deal with any challenge that comes your way!"

Remember to put the glass down today.

49. Why did the teacher hold up a glass in his class?

     A. Because he wanted to know how much the glass weighs.

     B. Because he wanted to ask some student to weigh the glass.

     C. Because he wanted to make his class more interesting.

     D. Because he wanted to ask his students a lot of questions.

50. In this passage, the underlined words "go numb" means_______.

     A．疼痛不止                  B．消瘦萎縮             C．松弛下垂    D．失去感覺(jué)

51. According to the passage, which of the following is TRUE?

     A. The teacher told his students to face the challenges bravely.

     B. The teacher taught his students how to deal with the problems.

     C. The teacher used to begin his class with a glass of water.

     D. The teacher usually begins his class by holding a glass of water.