下列能够体现“母法”与“子法”关系的是 （  ）

7800÷600=____

5600÷400=____

5100÷300=____

下列组合搭配正确的是（　　）

①“三北”防护林——主要防止水土流失  ②“南水北调”——缓解华北、西北地区水资源不足  

③“三江源”自然保护区——保持水土，涵养水源   ④“西气东输”——缓解华东地区能源供应紧张状况

根据材料完成下列各题。

Beethoven
Born in 1770 in Germany
A  musician (音乐家)
Died in 1827

Florence Nightingale
Born in Italy on May 12th, 1820
An English nurse
Died in 1910

Bill Gates
Born in I955 in the USA
Wrote Business @ the Speed of Thought
Owns Microsoft

Thomas Edison
Born in 1847 in the USA
Made over 1,000 inventions (发明)
Died in 1931

Yao Ming
Born on September 12th, 1980 in Shanghai, China
A basketball player
Played for the Houston Rockets, the USA