logo - 刷刷题
下载APP
【单选题】

A.A
B.B
C.C
D.D

A.
()
B.
举报
参考答案:
参考解析:
.
刷刷题刷刷变学霸
举一反三

【单选题】维生素E水解后被三氯化铁氧化,在此溶液中加入联吡啶,现象为( )。

A.
溶液血红色
B.
紫色沉淀
C.
溶液橙黄色
D.
橙黄色沉淀
E.
砖红色沉淀

【单选题】A.A B.B C.C D.D

A.
设y=y(x)由x=yy确定,则dy=()。

【单选题】主要作用于S期的抗肿瘤药是( )。

A.
氟尿嘧啶
B.
噻替派
C.
氮芥
D.
长春新碱
E.
博来霉素

【单选题】46() A.almost B.even C.truly D.usually

A.
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.
B.
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) .
C.
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.

【单选题】A.0 B.∞ C.lnf’(a) D.

A.
设f(x)>0,且导数存在,则=()。

【单选题】A.0 B.1 C. D.4

A.
若函数f(x)可导,且f(0)=f’(0)一,则=()。

【单选题】The underlined word "subjects" in Paragraph 5 means () A. branches of knowledge studied in a school B. something to be considered C. persons experimented on D. citizens in a country

A.
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.
B.
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.
C.
He set about measuring brain volumes of a thousand people of different ages and occupations.
D.
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.
E.
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.
F.
Faulkner concluded from his tests that there is a simple way to slow the contraction—using the head.
G.
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.
H.
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".

【单选题】55() A.try B.test C.experiment D.trial

A.
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.
B.
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) .
C.
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.