For the past year, he ______ a flat with

单词拼写。

1. Foods, such as rice, sugar, butter, oils and so on can give us e___________.

2. Children's _________ (好奇心) with everything plays an important part in their study.

3. It may take a few weeks for you to build up your _________(体力) again.

4. The ______________(起源) of some words are unknown.

5. Millions of people in Africa are still _____________(挨饿) to death at present.

6. I don't mind a_________ to others if I make a mistake.

7. D_________ is the sweet food served after the main course of a meal.

8. I had thought it was a terrible film. On the _________ (正相反), it was exciting.

9. Her excuse for being late was totally _________ (难以置信的).

10. The explorer told the boys about his _________ (冒险)in the Arctic

美籍华人、史学家唐德刚认为秦朝实现了“我国历史上第一次社会政治大转型”。这次转型的主要表现是 [ ]

A．世袭制取代禅让制

B．大分裂走向大一统

C．郡县制代替分封制

D．皇帝制度正式确立

（6分）某课外活动小组在探究“匀变速直线运动的加速度”的活动中，从打下的若干纸带中选出一条纸带，测出相邻两个计数点间的距离如图所示（两相邻计数点间还有4个点没有画出来）．打点计时器的电源频率为50Hz．据已知数据计算：

（1）匀变速运动的加速度a=         m/s²；打D点时，纸带的速度v_D =      m/s.（答案均保留3位有效数字）

（2）在计算加速度时，实验者不知道电源的频率变为小于50Ｈz，他们算出的加速度值与真实值相比是       （填“偏大”、“偏小”或“不变”）．

2012年6月7日，上海合作组织成员国元首理事会第十二次会议在人民大会堂举行。与会领导人就深化成员国友好合作以及重大国际和地区问题深入交换意见，并对上海合作组织未来发展作出规划，达成新的重要共识。会议同意接收增加了一个国家为上海合作组织观察员国，该国为（）

A.蒙古国

B.阿富汗

C.土耳其

D.巴基斯坦

为了确定诊断，还需要做的最主要检查是

A．尿细菌培养

B．血肌酐

C．腹部B超

D．静脉肾盂造影