Australia is the largest island in the world. It is a little smaller than China. It is in the south of the earth. Australia is big, but its population is small. The population of Australia is nearly as large as that of Shanghai.
Enough laws(法律) have been made to fight against pollution. The cities in Australia have got little air or water pollution. The sky is blue and the water is clean. You can clearly see fish swimming in the rivers. Plants grow very well.
Last month we visited Perth, the biggest city in western Australia and went to a wild flowers exhibition.
There we saw a large number of wild flowers we had never seen before. We had a wonderful time. Perth is famous for its beautiful wild flowers. In spring every year, Perth has the wild flowers' exhibition. After visiting Perth, we spent a day in the countryside. We sat down and had a rest near a path at the foot of a hill. It was quiet and we enjoyed ourselves. Suddenly we heard bells ringing at the top of the hill. What we saw made us pick up all our things and run back to the car as quickly as we could. There were about three hundred sheep coming towards us down the path.
Australia is famous for its sheep and kangaroos. After a short drive from any town, you will find yourself in the middle of white sheep.
材料一:镜头中的中国革命
材料二:日本军国主义者发动对华全面侵略,最致命的错误是大大低估了中国民众内部深深蕴藏着的那种无穷无尽的力量,特别是当中华民族处于生死关头时那种万众一心的民族凝聚力。战争结果大大出乎他们意料,深深地陷入中国全民族抗战的泥淖中无法自拔。
——金冲及《二十世纪中国史纲》
材料三:中国共产党不是以空话,而是以领导农民进行土地改革的事实,使他们迅速看清是谁代表着他们的利益,应该跟着谁走。……中国革命的军事斗争同土地制度的改革是不能分开的……没有土地制度的改革,没有广大农民的全力支持,军事斗争也会失去力量源泉而不可能战胜强大的敌人。
——金冲及《二十世纪中国史纲》
求:
为倡导节能环保,某科研机构设计了新型路灯.工作原理如图所示,控制电路中R2为半导体硅制成的光敏电阻,R2阻值随光强(国际单位坎德拉,符号:cd)变化的规律如下表所示,工作电路中开关S2的状态由R2两端的电压决定,光照足够强时,R2两端的电压很小,开关S2和与b点接触,处于断开状态,路灯L关闭;当光强降为20cd时,R2两端的电压刚好升至2V,开关S2与c点接触,电路接通,路灯L正常工作.已知,控制电路和工作电路中电源电压分别为6V和220V,路灯L正常工作时流为1A.
光强/cd | 5 | 10 | 20 | 25 | 40 | … |
电阻/Ω | 40 | 20 | 10 | 8 | 5 | … |
求:
在如图所示的容器中装着含有大量阴、阳离子的溶液,当溶液中插入连有电源的电极时,大量离子定向移动形成电流。测得在5s内共有5C正电荷和5C的负电荷通过容器的竖直界面OO′,则电路中电流表读数应为( )
Basketball |
|
the invention of it |
⒈What's the relationship between James Naismith and basketball? |
the development of it |
⒉What happened to basketball on December 21, 1891? ⒊What happened to basketball in Berlin in 1936? ⒋Do you know anything about the NBA games and the CBA games? |
the way to play it |
⒌How many teams are there in a basketball game? ⒍How is basketball played? |
the popularity of it |
⒎Will you give an example to show basketball is very popular? |
The story of basketball