在南海周边国家当中，（）是对整个西沙、南沙提出全部主权要求的国家，并提出所谓的“历史

1911年，科学家用一束平行高速的α粒子（带2个单位正电荷的氦原子）轰击金箔时，发现三种实验现象：①一小部分α粒子改变了原来的运动路径，原因是α粒子途径金原子核附近时，受到斥力而稍微改变了运动方向；②大多数α粒子不改变原来的运动方向，少数α粒子被弹了回来．

你分析的原因有

______

______．

本题图为一阶低通滤波电路，其通带截止频率f_H为（）。

A.

B.

C.

D.

Technology and the present generation of kids go hand in hand. Taking advantage of this factor, Lim Hojoon, the designer from South Korea, has come up with an educational gadget (小装置) especially for children. 

Kidget, as the name suggests, is a combination of two words – kid and gadget. This kid-friendly gadget has various uses. When your child is in a mood to read, it takes the form of a storybook. When the mood is to draw and color this wonder gadget turns into a perfect canvas (画布). Your child can freely give color to all his/her imaginations. Should he or she wish to have some fun, see this device change into a musical instrument. You too would enjoy doing activities with your loved one using this gadget. This touch screen device will definitely prove to be an ideal friend.

As many parents agree, in this age of technological advancements it is much easier to introduce children to new gadgets than adults. While many adults refrain (克制) from trying out something new, kids are more than prepared to take the leap. Keeping this fact in mind, Kidget is the perfect gift for the child of the 21st century. You will be surprised to see how fast your little one gets acquainted with the device. You might even find yourself lagging (落后) behind at times.

Kidget has another hidden advantage. It helps take the load off young shoulders. With three things rolled into one, a child has much less books, stationary items and related goods to carry. It comes with a promise to make life simpler for kids. Not only is it simple to use but also easy to carry along. The stylish protective case comes with a belt attached to it. Children up to 14 years of age, the targeted audience, enjoy the freedom that comes with it.

小题1:The Kidget probably can’t serve as a ______.

A．storybook

B．perfect canvas

C．musical instrument

D．television小题2:We learn from the second paragraph that Kidget ______.

A．has many functions

B．is only suitable for kids

C．can make kids addicted if not properly used

D．can change its shape and color小题3:A hidden advantage of Kidget is that ______.

A．it can be put into a schoolbag

B．children can carry much less with it

C．it has a stylish protective case

D．it contains all the textbooks小题4:We can infer from the text that Kidget ______.

A．has both advantages and disadvantages

B．hasn’t been put into use

C．needs to be further improved

D．is a perfect gift for kids

华支睾吸虫病的主要传染源是人和哺乳类动物，其中主要的宿主动物是（）

A.猪

B.狗

C.鼠

D.猫

E.牛

我国载人航天工程分为三个阶段，分别针对飞船、空间实验室、空间站关键性技术问题进行集中攻关。本次成功对接成为我国载人航天工程第二阶段的重要一步，为后期工作奠定了坚实的基础。这表明，我国的航天工作者（）

①把握了矛盾主要方面，揭示了事物的性质

②注重量的积累，为质变准备必要前提条件

③集中优势力量，抓住不同阶段的主要矛盾

④把握固有联系，努力避免主观臆造性联系

A.①②

B.②③

C.①③

D.②④