根据短文内容，选择正确答案。

    There were many famous explorers during 1400--1600. What were the names of the most famous explorers? What were the major achievements of the famous explorers? This website provides what you want to know.

    Famous Canadian Explorers   The discovery of the New World opened up new colonies(殖民地) in Canada. One of the most famous Canadian explorers was Louis Joliet who explored the Great Lakes area and discovered the Mississippi River.

Famous Spanish Explorers Famous Spanish explorers explored the Caribbean and South America. Just a few famous Spanish explorers conquered (征服) millions of local people who made up the nations of the Incas and the Aztecs. Famous Spanish explorers included Hernando Cortes, Francisco Pizarro, Hernando De Soto, Vasco Nunez de Balboa and Juan Ponce de Leon.

Famous English Explorers The most famous English explorers started their voyages of discoveries during the Elizabethan reign of Queen Elizabeth I. The most famous English explorers included Sir Walter Raleigh, Sir Francis Drake, Sir Martin Frobisher and Sir John Hawkins.

    Famous Portuguese (葡萄牙的) Explorers   The famous Portuguese explorers led the way when it came to exploration. The most famous Portuguese explorers included Ferdinand Magellan, Vasco da Gama, Bartholomeu Dias and Miguel Corte-Real.

我国的领海主权不容侵犯，南海是我国的固有领海，蕴藏着丰富的海洋资源．
（1）南海不仅蕴含着大量的煤、石油、天然气等常规能源，还蕴藏着大量的可燃冰．可燃冰（主要成分是CH₄）被科学家誉为“未来能源”，CH₄燃烧的化学方程式____ 可燃冰作为能源与煤、石油相比的优点是____ 

（2）南海某岛采用风力发电提供的电能对海水进行了如图1所示的综合利用．
①反渗析法淡化海水是利用海水中各成分的 ____ 不同分离出淡水．
②将高盐度浓缩海水进行____可以分离得到粗盐．
③用苦卤制取金属镁的流程图如图2：
上述转化过程中，所发生的反应属于复分解反应类型的步骤是____（填序号），步骤Ⅱ的化学方程式为____．利用苦卤制取氢氧化镁比“直接向海水中加入石灰乳制取氢氧化镁”的优势是____．

小明读一本故事书，第一天读了全书的 $\frac{1}{5}$ ，第二天读了24页，这时已读的与未读的比是2：3，这本故事书共有多少页？

“千人同心，则得千人之力；万人异心，则无一人之用。”这告诉我们 （）