下图为某河流生态系统受到轻度污染后的自我净化示意图，据图回答下列问题：前些年，人们为

根据短文内容, 从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Africa is a very diverse land with many different tribes. One tradition that many of these groups share is painting or marking their bodies and faces in color. They do this for many reasons. Some marks are used to identify people as part of a group.____ 1____ Let’s look at some different examples of body painting.

____2_______ Among the Masai of East Africa, when men are old enough to marry and make decisions for their people, they participate in a special ceremony in which they paint their heads and faces red. This ceremony take place every seven to fourteen years, so there is not an exact age for participating in it. The Samburu, also from East Africa, like to paint their faces and hair red because they think it looks attractive.

______3________ To show that he has killed a lion, a man will paint his body with a natural white material, making special marks to represent this accomplishment. The Masai men also use this white to show that they are on longer boys and are considered adults.

One quite unusual example of face painting is done by the Wodaabe people of West Africa. Once a year, they have a beauty contest for men. ___4_________ Then they add white and black circles and lines. Black paint is used near the eyes and on the lips to draw attention to the whiteness of their eyes and teeth, which the Wodaabe consider most beautiful.____ 5_________.

As you travel, enjoy the beautiful and bright colors of Africa.

A．Red is the common color in body painting because it often represents health and long life.

B．Other marks are used for ceremonies such as weddings and during times of war.

C．The ceremony expresses hope for rain.

D．The Masai men also have a unique way of showing that they are brave.E. The women then decide which man they like best.

F. The men pretend to fight each other.

G. The men paint their faces yellow and red.

单层管廊架主要构件包括（）。

A．水平拉筋

B．横梁

C．剪刀撑

D．管廊柱子

台州市人大代表郭子荣说：“我太爱提建议意见了，但是我提的都是反映老百姓迫切要求、群众呼声比较大的事情，因此，不管人家怎么想，还是要提，一次两次解决不了问题的，三次四次还是要提，盯住不放……”。这反映了 [ ]

A．人大代表的义务在不断增多

B．我国的民主制度在不断完善

C．人大代表的履职意识在不断增强

D．人大代表的地位在不断改变

耕地性质改变了该如何确权？

材料：袁隆平扎根农业第一线，他发明的杂交水稻技术，使中国整个水稻的产量提高了20％，增产的粮食每年可以解决7000万人的吃饭问题；李振声带领团队在当地农民的配合下培育出了优质小麦新品种，在我国北方大面积推广种植，大大提高了我国的小麦产量；著名的杂交玉米专家李登海，长期致力于玉米育种和高产栽培研究，创造了7个中国夏玉米高产纪录，他的种子在全国推广10亿多亩，增产1000多亿公斤，增效1000多亿元!

结合上述材料，从《认识社会与价值选择》的角度，谈谈这些科学家的成就对你的人生启示。