关于牙周病牙槽骨破坏的形式下面哪一个描述是错误的A．水平吸收是最常见的吸收方式 B．

German study suggests that people who were too optimistic about their future actually faced greater risk of disability or death within 10 years than those pessimists who expected their future to be worse.

The paper，published this March in Psychology and Aging，examined health and welfare surveys from roughly 40,000 Germans between ages 18 and 96.The surveys were conducted every year from 1993 to 2003.

Survey respondents (受访者) were asked to estimate their present and future life satisfaction on a scale of 0 to 10，among other questions.

The researchers found that young adults (age 18 to 39) routinely overestimated their future life satisfaction，while middle­aged adults (age 40 to 64) more accurately predicted how they would feel in the future.Adults of 65 and older，however，were far more likely to underestimate their future life satisfaction.Not only did they feel more satisfied than they thought they would，the older pessimists seemed to suffer a lower ratio (比率) of disability and death for the study period.

“We observed that being too optimistic in predicting a better future than actually observed was associated with a greater risk of disability and a greater risk of death within the following decade，”wrote Frieder R．Lang，a professor at the University of Erlangen­Nuremberg.

Lang and his colleagues believed that people who were pessimistic about their future may be more careful about their actions than people who expected a rosy future.

“Seeing a dark future may encourage positive evaluations of the actual self and may contribute to taking improved precautions (预防措施)，”the authors wrote.

Surprisingly，compared with those in poor health or who had low incomes，respondents who enjoyed good health or income were associated with expecting a greater decline.Also，the researchers said that higher income was related to a greater risk of disability.

The authors of the study noted that there were limitations to their conclusions.Illness，medical treatment and personal loss could also have driven health outcomes.

However，the researchers said a pattern was clear.“We found that from early to late adulthood，individuals adapt their expectations of future life satisfaction from optimistic，to accurate，to pessimistic，”the authors concluded.

小题1:According to the study，who made the most accurate prediction of their future life satisfaction?

A．Optimistic adults.

B．Middle­aged adults.

C．Adults in poor health.

D．Adults of lower income.小题2:Pessimism may be positive in some way because it causes people________.

A．to fully enjoy their present life

B．to estimate their contribution accurately

C．to take measures against potential risks

D．to value health more highly than wealth小题3:How do people of higher income see their future?

A．They will earn less money.

B．They will become pessimistic.

C．They will suffer mental illness.

D．They will have less time to enjoy life.小题4:What is the clear conclusion of the study?

A．Pessimism guarantees chances of survival.

B．Good financial condition leads to good health.

C．Medical treatment determines health outcomes.

D．Expectations of future life satisfaction decline with age.

根据放射性物质放射性的强弱，《国际危规》将放射性包件按危险程度划分为（）个等级，其中（）类危险性最大。

A．3；第III类

B．3；第I类

C．4；第IV类

D．4；第I类

以下关于移动400业务资费描述正确的是（）

A.移动400业务套餐无套餐月费，资费包括功能费和通信费

B.本地通信费为0.1元/分钟，长途费为0.3元/分钟

C.主叫方无需支付任何费用

D.被叫方按呼入时长支付语音通信费

某市某化工集团欲投资设立一家生产剧毒化学品的工厂，委托某安全服务中心对其项目进行安全评价。该安全服务中心接受委托后，在对项目进行考察时发现了一些不能保障安全的因素：供水水源距离不符合国家规定；生产工艺不完全符合国家标准；储存管理人员不适应生产、储存工作的要求。集团公司筹建项目负责人对安全服务中心的考察人员说：“你们拿了钱，只管办事就行了，照我们的意思来，其他的都好说，不然我们就换人。”
随后，集团公司将原定的报酬标准提高了1/3。安全中心明知有问题，但不愿意失去这个机会，便按照集团公司的意思，出具了筹建项目符合要求的安全评价报告。集团公司持这份安全评价报告向所在地的省人民政府经济贸易管理部门提出申请，省经济贸易管理部门在组织专家审查时，发现安全评价报告和其他有关材料存在疑点，经过审查，发现安全评价报告严重失实，是一份虚假的报告。
根据以上场景，回答下列问题：

当混凝土强度达到（）N/mm²前，不得在其上踩踏或安装模板及支架。

A.0.5

B.1.0

C.1.2

D.2.0