打一口深20米的井，打到第一米深处时需要40分钟，从第一米深处打到第二米深处需要

关于保证，依我国《担保法》的有关规定，下列叙述中不正确的是( )。

A．债权人抛弃债务人提供的物的担保的，在该担保物权的限度内，保证人的保证责任被免除

B．主债被确认无效后，保证人即不再承担任何责任

C．不管保证人承担的是履行责任还是赔偿责任，保证人都有可能承担赔偿责任

D．不具有法人资格的企业法人的分支机构以自己的名义对外签订的保证合同一般应认定无效；但因此而给债权人造成损失的，应负赔偿责任

第三部分：阅读理解（共20小题，每小题2分，满分40分）

阅读下列短文，从所给的四个选项（A、B、C、D）中，选出最佳选项。

Science summer camps are one of the best ways to improve creativity of students and teach them a practical approach towards science and its applications （应用）．Students taking part in the camps can learn to appreciate science and technology at an early age, to be better positioned for further learning and finally better prepared to face challenges．Apart from theories, scientific experiments and discussions are encouraged at these camps．

The science summer camps are usually held between June and August and it’s good for parents to start planning their children’s summer camps at least 6 to 7 months in advance．This period of time provides an opportunity for them to do proper research and save money．With more than 2,000 summer camps in the US, there is a wide variety for parents to choose from．If the child doesn’t like biology, there  is no point sending him to an anatomy （解剖学） science camp．Likewise （同样地）, if one thinks that his child limits himself to books throughout the school year, he should try and choose camps which provide students with an opportunity to move out in the open and be physically active．To make the task easier, there are many websites which provide online resource materials to help parents select a summer camp that fits the needs of their children．

Generally, a science summer camp costs between $ 150 and $ 500, depending on where the camp is located, how long it lasts and of course what subject it covers．Some of them also provide scholarships （奖学金） for bright students to encourage them．

56．A science summer camp offers students      ．

A．chances to be well prepared for future study

B．chances to research and save money

C．ways to get online resource materials

D．chances to live independently

57．What does the underlined word “them” in the second paragraph refer to?

A．Students     B．Organizers CScientists             D．Parents

58．We can infer （推断） from the second paragraph that        ．

A．it’s important for children to relax at the summer camps

B．online resource materials can help to organize a summer camp

C．proper camps should be chosen for children according to their needs

D．different parents should be chosen for children according to their needs

59．What do the costs of a science summer camp depend on?

A．Organizers’ efforts and suggestions．  B．Location, time and content．

C．Students’ likes and dislikes．       D．Effects and benefits．

水泥

下面哪一项不是长度型标注（）。

A.线性标注

B.对齐标注

C.基线标注

D.角度标注

恐惧症