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问题 单项选择题

The decision whether to add capital equipment to the production process should be based on:（）

A. future value, using the cost of financial capital as a benchmark.

B. present value, using the marginal revenue product of capital as a benchmark.

C. present value, using the cost of financial capital as a benchmark.

答案

参考答案：C

解析：

The marginal revenue product of capital is the prospective gain from adding capital to the production process. Since these gains occur many years into the future, they must be discounted at the cost of financial capital to obtain a present value. It is this present value that is compared with the cost of the project to determine whether or not the project should be accepted.

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     French doctors and American scientists have reported doing an operation in which the doctor was outside

the operating room. This kind of operation is known as robotic operation.

     Doctor Marescaux did the operation in an office in New York City last month, while a sixty-eight-year-old

woman patient was in a hospital in Strasbourg, France.

     A doctor in Strasbourg got the patient ready. He placed medical tools and a small video camera in her

stomach area. Doctor Marescaux in New York watched the patient on a video screen. Then he used the

computer to send messages to the robot machine. The robot moved the tools that cut the woman's gallbladder

(胆囊) away. The woman got well soon after the operation and left the hospital two days later.

     Experts say the main problem with such a robotic operation is based on high-speed telecommunications

between the doctor and the robot. Technology must be able to send a doctor's order to a robot to move the

tools quickly.

     Experts also say a successful robotic operation will improve an operation. For example, the robot can make

much smaller movements than a person can. A robot machine can turn tools in ways that a doctor's hand

cannot.

     Doctors say such a robotic operation will make possible safer and better operations in the future. They say

it will improve doctor training. It will also mean that doctors could do an operation on people in dangerous

places far away. And it could mean that people could have operations done by top doctors without having to

travel to the city where doctors work.

1. "Robotic operation" means "______".

A. a special kind of robot invented by doctors

B. an operation done far away

C. an operation done with the help of a robot

D. something done to mend a robot

2. We use the robot in the operation because ______.

A. it can send messages at a high speed

B. even a top doctor can't do the operation himself

C. it can make the operation safer and better

D. operations can be done without any doctors

3. If we want to use the robot in the operation, we must solve the problem of ______.

A. top doctors

B. smaller movements

C. doctor training

D. high-speed telecommunications

4. If the smaller movement can't be done by doctors in the operation, we may use ______ to solve it.

A. more tools

B. a robot machine

C. a video camera

D. telecommunications

5. Which of the following is NOT true?

A. Robotic operation is good for doctor training.

B. Robotic operation has been used in the USA.

C. Experts speak highly of robotic operation.

D. The robot is used to watch the patient clearly.

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多项选择题

长期投资者与投机者的区别表现在（　　）。

A．风险偏好不同

B．资金来源不同

C．持有证券的时间不同

D．目的不同
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