[多项选择]Discussion
Topic: Changes of the World in Fifty Years
Now, Candidate A and Candidate B, here is a list of possible changes of the world in fifty years.
(Hand out the list to the candidates and let them read it through. )
What do you think are the most possible changes of the world in fifty years I’d like each of you to choose three from the list and tell each other why. If you hold different opinions you may argue and you may also add your own ideas that are not listed here. You just talk to each other and I won’t join you. You have 5 minutes. All right. Would you begin (The interlocutor may sit back and intervene only when necessary. )
Most Possible Changes of the World in Fifty Years:
●Living longer
●Aliens
●Colonies in space
●Cures for spinal injuries
●Obesity solved
●Robots
●Green energy
(For candidates)

[填空题]Our class has fifty students．
______ fifty students in our class．

[填空题]The largest stock market in the world is the New York Stock
Exchange. It is also the oldest financial market in the United States.
Its history dates to 1792. Today, two-thousand-eight hundred companies (1)
trade their shares at the New York Stock Exchange. Together, the value (2)
of those stocks is almost fifteen-million-million dollars. These
companies are all public traded. That means any investor can buy their (3)
stock. A foreign company can trade on the New York Stock Exchange by
placing some of its shares in a bank. An American Depositary Receipt is
giving in place of the stock, and can be traded on the exchange. About (4)
four-hundred-seventy companies from fifty-one other nations are
represented on the New York Stock Exchange.
Stock is share in the ownership of a company. Debt is also traded (5)

[单项选择]Fifty volunteers were alphabetically divided into two equal groups, Group A to participate (91) a 7-week exercise program, and Group B to avoid (92) exercise of any sort during those 7 weeks. On the day before the exercise program began, all 50 men participated in a step-test. This (93) of stepping up and down on a 16-inch bench (94) 30 steps a minute for 5 minutes. One minute after completion of the step-test the pulse (95) of each subject was taken and recorded. This (96) as the pretest for the experiment. For the next 7 weeks, subjects in the experimental group (Group A) rode an Exercycle (a motor-driven bicycle-type exercise machine) for 15 minutes each day. The exercise schedule (97) for riders to ride relaxed during the first day’s ride, (98) holding on to the handle bars and foot pedals (99) the machine moved. (100) , for the next 3 days, they rode relaxed for 50 seconds
A. acting
B. performing
C. doing
D. riding