夸克以非系统方式存在。

森林中的黑熊特别喜欢偷食蜂蜜，同时也常常遭到蜜蜂的群体攻击．黑熊的这种行为属于______行为，参与战斗的蜜蜂是______，蜜蜂群体内各成员间有明确分工，这属于______行为．

下图是自来水厂净水过程示意图

请根据图示回答下列问题：

（1）自来水厂生产自来水，使用的净水方法有_____________

A．沉淀

B．过滤

C．煮沸

D．蒸馏 E.吸附（2）取水后加入的絮凝剂是_____________，加入絮凝剂的作用是______________________。

（3）过滤池中过滤掉水中的____________ _______。

（4）汲附池中加入活性炭除去水中的___________________。

（5）清水池中投药消毒是为了除掉水中的___________________。

（6）自来水厂净水过程中，_____________（能或不能）使硬水变成软水。

What is your favorite color? Do you like yellow, orange or red? If you do, you must be an optimist (乐观者), a leader, an active person who enjoys life, people and excitement. Do you prefer grays (灰色) and blues? Then you are probably quiet, shy and you would rather follow than lead. If you love green, you are strong-minded and determined (意志坚定的). You wish to succeed and want other people to see you are successful. At least this is what psychologists (心理学家) tell us, and they should know, because they have been seriously studying the meaning of color preference (爱好), and the effect (影响) that colors have on human beings. They tell us that we don’t choose our favorite color as we grow up. If you happen to love brown, you did so as soon as you opened your eyes, or at least as soon as you could see clearly.

　　 A yellow room makes us feel more cheerful (开心的) and more comfortable (舒服的) than a dark green one, and a red dress rings warmth and cheer to the saddest winter day. On the other hand, black is depressing (压抑). Light and bright colors make people not only happier but more active. It is a fact that factory workers work better, harder, and have fewer accidents when their machines are painted orange rather than black or dark gray.

　　 Remember, then, that if you feel low, you can always brighten your day or your life with a new shirt or a few colorful things. Remember also that you will know your friends and your enemies better when you find out what colors they like and dislike. And don’t forget that anyone can guess a lot about your character when you choose a piece of handkerchief.

小题1:According to this passage, _________.

A．one can choose his color preference　　

B．one is born with his color preference

C．one’s color preference is changeable

D．one has to choose his favorite color as soon as he can see clearly小题2:We would pay attention to colors because _______.

A．colors do have effect on our moods(情绪)

B．colors may have effect on our work and study

C．light and bright colors make people happy

D．you can know your friends better by the colors they like or dislike小题3: The main idea of this passage is ________.

A．one’s color preference shows one’s character

B．you can brighten your life with wonderful colors

C．psychologists have been studying the meaning of color preference

D．one’s color preference has something to do with his character and colors have effects on human beings小题4: "I am feeling black" means ______.

A．I am feeling well 　　　　

B．I am very happy 　　

C．I am excited 　　

D．I am depressed

重礼

简述种子质量责任。