根据SRK模型，在决策中，出现注意方向错误主要发生在（） A.基于技能的操作阶段 B

降水量分布不均匀将影响到植物的______和植物的_______类型。

用压缩空气吹扫电机时，风压应调整在（）kPa。

A、200～300

B、350～400

C、400～500

D、500～600

全长2800多千米的长江中下游河段，污染总长度达600千米。污染物主要是工业废水和固体工业、生活垃圾。长江年水土流失14.1亿吨，已造成中下游湖泊淤积。根据材料，你认为下列说法正确的是：[ ]

A、必须坚持可持续发展战略

B、发展经济必然带来环境污染

C、保护环境是我们一切工作的中心

D、我国的环境形势依然相当严峻

Watercolor（水彩画） is the oldest paints known. It dates back to the early cave men. They discovered that they could mix the natural colors found in the earth with water. In this way they could add lifelike qualities to drawings of animals and other figures on the wall of caves.

Fresco（壁画）, one of the greatest art forms, is done with watercolor, it is created by mixing paints and water and applying these to wet plaster（灰泥）. Of the thousands of people who stand under Michelangelos’ works in the Sistine Chapel, very few know they are looking at perhaps the greatest watercolor painting in the world.

The invention of oil painting by the Glemish masters in the fifteenth century made fresco painting go downhill, and for the next several centuries watercolor was used mainly for doing sketches（素描） or as tool for study. It was not until the eighteenth and nineteenth centuries that English painters put back watercolor as a serious art form. The English have widely-known love for the outdoors and also for small, private pictures. The softness of watercolor had a strong attraction for them.

The popularity of watercolor continued to grow until the twentieth century. The United States took the place of England and became the center of watercolor. It produced such well-known watercolor artists as Thomas Eakins and Andrew Wyeth.

小题1: The first watercolor users were___________

A．the early cave men

B．Italian fresco artists

C．Flemish masters

D．the English artists in the 18th century小题2: In the 16th and 17th centuries the artists thought__________.

A．watercolor was more costly, but better

B．oil painting lasted less long, but clearer and brighter

C．watercolor was not suitable for serious works

D．oil painting was difficult to use小题3: According to the passage, watercolor painting was put back in England because ______

A．it was easy to use outdoors

B．it was a strong tool

C．it was extremely bright in color

D．it was well suited to popular tastes小题4: What is the passage mainly about?________

A．the gradual weakness of fresco painting.

B．Oils having more power of influence over watercolor.

C．The rediscovery of watercolor in England.

D．The start and development of watercolor.