销售门户系统中的营销工具包括（）。A.客户商机提示 B.营销话术 C.营销动态 D.

以下对前期物业管理合同关系的表述，正确的是( )。

A．是根据房地产开发企业与物业服务企业签订的前期物业服务合同

B．不是根据业主和物业服务企业之间签订的物业服务合同

C．不是根据建设单位与物业服务企业签订的物业服务合同

D．是根据业主和物业服务企业之间签订的前期物业服务合同

某校为了丰富校园文化，举行初中生书法大赛，决赛设置了6 个获奖名额，共有ll 名选手进入决赛，选手决赛得分均不相同．若知道某位选手的决赛得分，要判断他能否获奖，只需知道这11 名选手决赛得分的[ ]

A .中位数    

B. 平均数    

C. 众数    

D. 方差

心理健康教育课“学科化”的表现：（）

A、教育内容和选材生活化不够 

B、重认知结构，轻情感目标，忽视学生的体验 

C、活动过程重师生互动关系沿袭传统课堂教学处理 

D、备课仅以教材为中心

Have you ever thought, “I wish I could take a year off and just travel around the world”? Well, three lucky American teenagers were able to do just that. The teens—two males and one female--got an all-expenses paid, yearlong hike to five continents.

This trip didn’t include any five-star hotels or shopping funs. Eighteen-year-old Jamie Fiel from Keller, Texas, 17-year-old Arsen Ewing from Canyon, California, and 16-year-old Tyler Robinson from Lincoln, Massachusetts, didn’t expect fancy treatment. They signed up for the experience of a lifetime, which included hard work, often uncomfortable accommodations, and encounters with some of nature’s most dangerous animals and environments.

Jamie, Arsen, and Tyler were among hundreds of high school kids nominated by their science teachers to take this trip. Earthwatch Institute sponsored (赞助) this adventure. Each year, Earthwatch employs thousands of volunteers worldwide to help with scientific research projects.

The group went all around the world to get a close look at the most pressing environmental issues of our time. Their assignments were as varied as their locations, and included measuring and attending pink flamingos in Kenya’s Great Rift Valley, and tracking giant sea turtles in Costa Rica.

As they worked with the Earthwatch scientists, Jamie, Arsen, and Tyler began to understand that we are at a critical moment in the life of our planet. Time for change is running out. As the teens went from country to country and witnessed different environmental dangers and challenges, they understood that solutions to important environmental issues start with the power of one person's actions. They realized that each of them can make a difference.

小题1:These teenagers went on the journey around the world _____.

A．to experience the most serous environmental problems on the earth

B．to bring the kindness of America to the other parts of the world

C．to go on sightseeing around the world

D．to call on more teenagers to join Earthwatch Institute小题2:What’s true about their journey?  

A．They had to pay for their journey on their own expense.

B．They often had to move from one hotel to another.

C．They had to take great pains to collect environmental information.

D．They received a warm welcome every time they arrived at a new place.小题3: It can be inferred that Earthwatch Institute could be _____.

A．an international university that takes in students from all over the world

B．a TV station that makes programmes on the beautiful scenery of the earth

C．a travel agency that organizes adventure trips specially for school children

D．an organization that brings science to life for people concerned about earth’s environment小题4: What did they these teenagers learn from the journey?

A．It was high time that people protected the environment.

B．Long journey was not suitable for school children.

C．It should take the whole world to help the children.

D．Environmental problems can be solved if school children take part.

甲某为举办一次展示会，向其好友乙某借款2万元。乙某早就对甲某所有的一辆豪华摩托车垂涎三尺，于是要求甲某将摩托车作为质押担保，甲某同意。于是于2003年1月9日，双方签订了质押借款协议书。协议约定，乙某借给甲某现金2万元，借期1年，甲某以摩托车作为质押担保，如果甲某在还款期限到来后半个月内不还款的，摩托车即归乙某所有。另外，甲某还提出在质押期间乙某不得使用摩托车的条件，乙某同意。合同签订之日，乙某将2万元现金支付给了甲某，甲某亦将摩托车移交给了乙某占有。质押期间，乙某擅自使用甲某提供的摩托车学开摩托，不甚将该车撞毁。借款到期后，甲某将借款本息还清后，要求乙某返还摩托车时，乙某才说出摩托车被撞毁的事由。双方因赔偿金额达不成一致而形成纠纷，甲某诉至法院。

质押借款协议书中“如果甲某在还款期限到来后半个月内不还款的，摩托车即归乙某所有”的约定是否有效？本案中的质押借款协议是否有效？