放映幻灯片时，幻灯片到镜头的距离为25cm，则镜头焦距可能为（ ） A．11cm

已知|3x-6|+（y+3）²=0，则3x+2y的值是______．

发动机的最佳工作温度是水温（）

A.85-95度

B.95-105度

C.85-105度

“大肠有寒者，多______；有热者，多______；小肠有寒者，其人______，有热者，必______。”

In general, people talk about two groups of colours warm colours and cool colours. Researchers in psychology think that there are also two groups of people people who prefer warm colours and people who prefer cool colours.

The warm colours are red, orange and yellow. Where there are warm colours and a lot of light, people usually want to be active. People think that red, for example, is exciting. Sociable people, those who like to be with others, like red. The cool colours are green, blue and violet. These colours, unlike warm colours , are relaxing. Where there are cool colours, people are usually quiet. People who like to spend time alone often prefer blue.

Red may be exciting, but one researcher says that time seems to pass more slowly in a room with warm colours than in a room with cool colours. He suggests that a warm colour, such as red or orange is a good colour for a living room or restaurant. People who are relaxing or eating do not want time to pass quickly. Cool colours are better for offices or factories if the people who are working there want time to pass quickly.

Researchers do not know why people think some colours are warm and other colours are cool. However, almost everyone agrees that red, orange, and yellow are warm and that green, blue and violet are cool. Perhaps warm colours remind people of warm days and the cool colours remind them of cool days. Because in the north the sun is higher during summer, the hot summer sunlight appears yellow.

小题1:Which of the following colours belong to cool colours?

A．Yellow, green.

B．Blue, violet.

C．Black, blue.

D．Brown, white.小题2:Which of the following statements is not true?

A．Sociable people like warm colours.

B．Warm colours can make people excited.

C．People who like to be with others don’t like red.

D．Where there are warm colours, people want to be active.小题3:Which is the right colour for different rooms?

A．Red or orange for offices.

B．Orange for dining-rooms.

C．Blue for bedrooms.

D．Red for studies.小题4:What is the main idea of the last paragraph?

A．It shows the reason why people think some colours are warm and others are cool.

B．Warm colours remind people of warm days.

C．Cool colours remind people of cool days.

D．People have an agreeable opinion of warm colours and cool colours.

( )担负投资计划反馈的职能，及时向投资决策委员会提供市场动态信息。

A．市场部

B．交易部

C．投资部

D．研究部