问题 选择题

迷迭香酸是从蜂花属植物中提取得到的酸性物质其结构如图所示:下列叙述正确的是

A.迷迭香酸属于芳香族化合物,分子式C14H18O8

B.迷迭香酸含有和官能团有:羧基、酯基、酯基

C.1mol迷迭香酸最多能和含6mol Br2的浓溴水发生反应

D.1mol迷迭香酸最多与含5mol NaOH的水溶液或9mol H2完全反应

答案

答案:B

题目分析:A、由结构式知迷迭香的分子式为C18H16O8,错误;C、苯环上有6个H可以被Br取代,结构中还有1个C=C可与Br2加成,消耗7molBr2,错误;D、每个酚羟基可与NaOH反应,羧基可与NaOH反应,酯在碱性条件下水解后生成的羧基也可与NaOH反应,所以1mol迷迭香酸可与6molNaOH反应,与H2发生加成反应时除苯环,还有1个C=C需加成,酯结构中的C=O不与H2加成,错误。

判断题
阅读理解

A recent study, which was published in last week’s Journal of the American Medical Association, offers a picture of how dangerous it is to get a lift from a teenage driver. Indeed, a 16-year-old driver with three or more passengers has three times the possibility of a serious accident, compared with a teenager driving alone.

The authors also found that the death rates for teenage drivers increased greatly after 10 p.m., and especially after midnight. With passengers in the car, the driver was even more likely to die in a late-night accident.

Robert Foss, a scientist at the University of North Carolina Highway Safety Research Center, says the higher death rates for teenage drivers have less to do with “really stupid behavior” than with just a lack of driving experience. “The basic issue is that adults who are responsible for giving out licenses fail to recognize how complex and skilled driving is.” he says.

Both he and the author of the study believe that the way to mitigate (使缓解) the problem is to have states set up so-called graduated licensing systems, in which getting a license is a process with several stages. A graduated license requires that a teenager first prove himself able to drive in the presence(在场)of an adult, followed by a period of driving with night of passenger restrictions (限制) before graduating to full driving rights.

Graduated licensing systems have reduced teenage driver crashes, according to recent studies.

小题1:Which of the following situations is most dangerous according to the passage?

A.Adults giving a lift to teenagers on the highway after 10 p.m.

B.Adults driving with three or more teenage passengers late at night.

C.A teenager driving after midnight with passengers in the car.

D.A teenager getting a lift from a stranger on the highway at midnight.小题2:According to Robert Foss, the high death rate of teenage drivers is mainly due to _______.

A.their frequent driving at night

B.their lack of driving experience

C.their wrong way of driving

D.their driving with passengers小题3:According to Paragraph 3, which of the following statements is TRUE?

A.Teenagers should spend more time learning to drive.

B.Driving is a skill too complex for teenagers to learn.

C.Restrictions should be forced on teenagers demanding to take driving licenses.

D.The licensing department is partly responsible for teenagers’ driving accidents.小题4:A suggested measure to be taken to reduce teenagers’ driving accidents is that ______.

A.driving in the presence of an adult should be made a rule

B.they should be forbidden to take on passengers

C.they should not be allowed to drive after 10 pm

D.the licensing system should be improved