A．0
B．∞
C．lnf’(a)
D．

若函数f(x)可导，且f(0)=f’(0)一，则=（）。

If you want to stay young, sit down and have a good think. This is the research result of Professor Faulkner, who says that most of our brains are not getting enough exercise and as a result, we are ageing unnecessarily soon.

Professor Faulkner wanted to find out why healthy farmers in northern Japan appeared to be losing their ability to think and to reason at a relatively early age, and how the process of ageing could be slowed down.

He set about measuring brain volumes of a thousand people of different ages and occupations.

Computer technology enabled him to obtain precise measurements of the volume of the front and side sections of the brain, which relate to intelligence and emotion, and determine the human character.

Contraction of front and side parts—as cells die off—was observed in some subjects in their thirties, but it was still not evident in some sixty and seventy-year-olds.

Faulkner concluded from his tests that there is a simple way to slow the contraction—using the head.

The findings show that contraction of the brain begins sooner in people in the country than in the towns. Those least at risk, says Faulkner, are lawyers, followed by university professors and doctors. White-collar workers doing routine work are, however, as likely to have shrinking brains as the farm workers, bus drivers and shop assistants.

Faulkner’s findings show that thinking can prevent the brain from shrinking. Blood must circulate properly in the head to supply the fresh oxygen the brain cells need. "The best way to maintain good blood circulation is through using the brain," he says. "Think hard and engage in conversation. Don’t rely on pocket calculators".

设，则=（）。

Sometimes, people (41) your life and you realize that they are there (42) some purpose, to (43) you a lesson, or to help you (44) who you are or who you want to become. You’d never know who these people (45) be, your friend, your classmate, your neighbor, your co-worker, your teacher, or (46) a stranger, but they will deeply (47) your life in some way.

And sometimes things (48) to you that may seem (49) , painful and horrible at first, but (50) , you realize that without (51) those difficulties you would never know your strength, (52) or potential. Everything happens for a (53) . Nothing happens by (54) or by means of good luck. Illness, great achievement, love, injury and failure all come to (55) the limits of your soul. Without these tests, life would be like a straight and fiat road, but it goes (56) . It would be safe and comfortable, but dull and completely (57) .

Those people who affect your life, and the failure and the success you experience can help you to create who you are and who you become. Even the bad experiences can (58) from. In fact, they are the most important ones. If someone breaks your heart, or hurts you, please (59) them, for they helped you to learn about the importance of being careful when you open your heart. If someone loves you, love them (60) , because they are teaching you to love and how to open your heart and eyes to things.

She does not have a watch.

She is nervous about the appointment.

Tom’s watch keeps good time.

Tom is afraid to be late.

for

to

with

in

1.560×10³

1.560×10²

1.560

0.1561

0.1560

could destroy

hadn’t called

firemen

broke out

α受体阻断药

β受体阻断药

α,β受体阻断药

α₁受体阻断药

β₁受体阻断药

氢氧化钠滴定液

薄层色谱法

高氯酸滴定液

高效液相色谱法

乙二胺四醋酸滴定液

若函数f(x)可导，且f(0)=f’(0)一，则=（）。

If you want to stay young, sit down and have a good think. This is the research result of Professor Faulkner, who says that most of our brains are not getting enough exercise and as a result, we are ageing unnecessarily soon.

Professor Faulkner wanted to find out why healthy farmers in northern Japan appeared to be losing their ability to think and to reason at a relatively early age, and how the process of ageing could be slowed down.

He set about measuring brain volumes of a thousand people of different ages and occupations.

Computer technology enabled him to obtain precise measurements of the volume of the front and side sections of the brain, which relate to intelligence and emotion, and determine the human character.

Contraction of front and side parts—as cells die off—was observed in some subjects in their thirties, but it was still not evident in some sixty and seventy-year-olds.

Faulkner concluded from his tests that there is a simple way to slow the contraction—using the head.

The findings show that contraction of the brain begins sooner in people in the country than in the towns. Those least at risk, says Faulkner, are lawyers, followed by university professors and doctors. White-collar workers doing routine work are, however, as likely to have shrinking brains as the farm workers, bus drivers and shop assistants.

Faulkner’s findings show that thinking can prevent the brain from shrinking. Blood must circulate properly in the head to supply the fresh oxygen the brain cells need. "The best way to maintain good blood circulation is through using the brain," he says. "Think hard and engage in conversation. Don’t rely on pocket calculators".

设，则=（）。

Sometimes, people (41) your life and you realize that they are there (42) some purpose, to (43) you a lesson, or to help you (44) who you are or who you want to become. You’d never know who these people (45) be, your friend, your classmate, your neighbor, your co-worker, your teacher, or (46) a stranger, but they will deeply (47) your life in some way.

And sometimes things (48) to you that may seem (49) , painful and horrible at first, but (50) , you realize that without (51) those difficulties you would never know your strength, (52) or potential. Everything happens for a (53) . Nothing happens by (54) or by means of good luck. Illness, great achievement, love, injury and failure all come to (55) the limits of your soul. Without these tests, life would be like a straight and fiat road, but it goes (56) . It would be safe and comfortable, but dull and completely (57) .

Those people who affect your life, and the failure and the success you experience can help you to create who you are and who you become. Even the bad experiences can (58) from. In fact, they are the most important ones. If someone breaks your heart, or hurts you, please (59) them, for they helped you to learn about the importance of being careful when you open your heart. If someone loves you, love them (60) , because they are teaching you to love and how to open your heart and eyes to things.

She does not have a watch.

She is nervous about the appointment.

Tom’s watch keeps good time.

Tom is afraid to be late.

for

to

with

in

1.560×10³

1.560×10²

1.560

0.1561

0.1560

could destroy

hadn’t called

firemen

broke out

α受体阻断药

β受体阻断药

α,β受体阻断药

α₁受体阻断药

β₁受体阻断药

氢氧化钠滴定液

薄层色谱法

高氯酸滴定液

高效液相色谱法

乙二胺四醋酸滴定液