疑似群障单中，确认疑似群障为群障的方式有（） A.手工确认 B.派发网络单 C.自动

对象根据所接受的消息而做出动作，同样的消息被不同的对象所接受时可能导致完全不同的行为，这种现象称为______。

B

Most American kids love Halloween treats, but a bucket of Halloween candy can be a dentist’s nightmare. Some parents try to get rid of half of the candy after their children go to bed, but dentists say parents also need to separate the good kinds of treats from the bad.

It is not exactly what a child eats that truly matters, but how much time it stays in his mouth. According to pediatric dentist Dr. Kaneta Lott, the most damaging stuff is something that is sticky or very hard and thus stays in the mouth for a long time. This is because we all have bacteria in our mouths. When we eat, the bacteria take our food as their food and produce an acid that destroys the surface of the teeth, causing cavities to form. The longer the food stays in the mouth, the more likely cavities will develop. Therefore, potato chips are worse than candy because they get stuck between teeth. For the same reason, raisins and crackers are not the best choice. Hard candies take a long time to consume and are also a bad choice for Halloween treats

If children really love candy, dentists recommend that they eat chocolate instead. Unlike hard candies, chocolate dissolves quickly in the mouth. Besides, chocolate contains tannins, which help to kill some of the bacteria in the mouth. But no matter what a child eats, brushing after each meal is still the best way to fight cavities.

55．What is the main purpose of this passage?

A. To discuss how cavities can be treated.

B. To point out the problems with Halloween celebrations.

C. To tell parents what sweets are less damaging to their children’s teeth.

D. To teach parents the meaning of Halloween candies for their children.

56．Why are hard candies especially bad for teeth?

A. They may break the child’s teeth.

B. They contain too much sugar.

C. They help bacteria to produce tannins.

D. They stay in the mouth for a long time.

57．According to the passage, which of the following is a better choice for Halloween treats?

A. Chocolate.                     B. Crackers.                        C. raisins.                            D. Potato chips.

58．According to the passage, which of the following is true of tannins?

A. They are produced when the bacteria digest the food.

B. They help to get rid of some bacteria in the mouth.

C. They help chocolate to dissolve more quickly.

D. They destroy the surface of the teeth.

以下不属于口腔结核临床表现的是（）

A.结核初疮

B.寻常狼疮

C.溃疡基底较硬

D.溃疡边缘呈鼠啮状

E.潜掘状溃疡

水利改革发展的基本原则：（）

A、功能拓展、统筹兼顾、人水和谐、政府主导、改革创新

B、民生优先、统筹兼顾、人水和谐、政府主导、改革创新

C、民生优先、统筹发展、人水和谐、政府支持、改革创新

D、环境友好、统筹发展；人水和谐、政府支持；扩大开放

某高层居民住宅楼正在进行旧房改建，工程由甲建筑装饰装修公司总承包，其中外立面墙壁施工分包给乙公司。乙公司施工队在楼外墙搭建脚手架，对外墙进行节能环保改造，增加隔热层。施工中未对易燃物进行防火处理，4名电焊工只有1名具有上岗证，电焊工人焊接操作不当，引燃易燃材料，造成大楼起火，50多名居民遇难，大火直接经济损失1亿元人民币。

根据我国《安全生产法》规定，生产经营单位主要负责人承担的安全生产职责有( )。

A．建立健全本单位安全生产责任制

B．发生重大生产安全事故时，应立即组织抢险，不得在事故调查期间擅离职守

C．保证本单位安全生产投入的有效实施

D．为从业人员缴纳保险费

E．及时报告安全生产事故