咳嗽无力，气短声低，咯痰清稀色白，偶或带血，午后潮热，自汗，盗汗，纳少神疲，便溏，面

It seems to be strange to you that there is a blind spot (盲点)on the eyes. Here is an interesting experiment (实验) that can make something disappear, when one eye is open.

Make a card about the size of a postcard and write two English letters L and R on it, L on the left and R on the right. First, hold the card about 80 cm away and you see both the letters. Then close your right eye and look at the letter R only with your left eye. And now, as you move the card slowly towards you, you’ll find the letter L disappearing. But if you move the card nearer to your face, the letter will be seen again. Now do the same experiment with your left eye closed, you’ll find the letter R disappearing.

Why does the letter disappear? It is because there is a blind spot on the eyes. When the image (影像) of the letter falls on the blind spot, it won’t be seen. That is why either of the letters disappears.

小题1:The writer of the passage thinks that ________ there is a blind spot on the eyes.

A．few people know

B．no one knows

C．most people know

D．all the people know小题2:The word “disappear” in the passage means ________ in Chinese.

A．出现

B．远离

C．消失

D．靠近小题3:You fail to see the letter L in the experiment because ________.

A．your eyes are poor

B．its image falls on the blind spot

C．your left eye is not open

D．you move it close to your eye小题4:In which order (顺序) should you do the experiment?

①Hold the card

②Move the card nearer

③Close your right eye

④Write two English letters

⑤Look at the letter R

⑥Make a card

A．④⑥①②③⑤

B．①③⑥④⑤②

C．⑥①④③②⑤

D．⑥④①③⑤②小题5:The passage mainly (主要) tells us ________.

A．the blind spot can move

B．an interesting experiment

C．where the blind spot is

D．there is a blind spot on the eyes

历史名人的一举一动往往透露出一个时代的信息。

阅读下列材料：

材料一

材料二　蔡元培的三次婚姻

第一次婚姻：1889年，迎娶王昭(1900年病逝)；父母之命、媒妁之言。

第二次婚姻：1902年，迎娶黄仲玉(1920年病逝)；他提出五个条件：不缠足，识字，男不得娶妾、姨太太，若夫先死妻可改嫁，意见不合可离婚；婚礼：开演说会代替闹洞房。    

第三次婚姻：1923年，迎娶周峻；他再次提出条件：具备一定文化素质，年龄略大，熟谙英文，能成为研究助手；婚礼：蔡元培西装革履，周峻身披白色的婚纱。在婚礼的宴席上，蔡元培向大家讲述了他和周峻的恋爱经过。

（1）根据材料一，指出近代中国男装的变化。并结合所学知识，分析近代中国服饰西化的原因。 

（2）结合材料二，概括指出近代中国婚俗的变迁过程。

简述定值保险合同的优点与缺点

水生生物养护最重要的措施是什么？

具有局部浸润性生长的肿瘤为

A．海绵状血管瘤
B．囊性水瘤
C．牙龈瘤
D．成釉细胞瘤
E．蔓状血管瘤