问题 选择题

等质量的下列金属,放入足量的稀硫酸中,生成氢气最少的是(  )

A.Mg

B.Na

C.Fe

D.Zn

答案

A、等质量的金属镁、钠、铁、锌中,与足量的稀硫酸反应,根据金属与氢气的质量关系,镁与生成的氢气的质量比为12:1,大于钠、铁、锌的23:1、28:1、32.5:1,因此镁镁生成的氢气最多.此项错误.

B、等质量的金属镁、钠、铁、锌中,与足量的稀硫酸反应,钠与生成的氢气质量比23:1,大于锌和铁的32.5:1和28:1,因此此项错误.

C、等质量的金属,与足量的稀硫酸反应,铁与生成的氢气质量比28:1大于锌与氢气的32.5:1,生成氢气比锌多,此项错误.

D、等质量的金属,与足量的稀硫酸反应,锌生成的氢气最少,故此项正确.

故选D

阅读理解

Mauritius, with its full name the Republic of Mauritius, an island country, lies 1,200 miles off the southeastern coast of Africa, and just east of Madagascar, another African island country, which is larger by far than Mauritius. It covers 788 square miles and has a population of 1,100,000, about 750,000 Indians, 300,000 Chinese and 20,000 Whites included. They are living together peacefully, although they share such different beliefs as Hindu, Roman Catholic, Muslim and so on. 

The country can be divided into many parts with different climates all because of its peculiar terrains (地形). In the center there are volcanoes (火山) several thousand feet high, and 90% of its arable land is covered with sugarcane.

There were no people living on the island before the Dutch landed on it in 1638. The Dutch relinquished it in 1710, and five years later, the French came and succeeded in planting sugarcane there. It was conquered (征服) by Britain in 1818. As a result, its official language is English. The main big cities are Beau-Bassin and Mahebourg, with Port Louis as its capital.

Mauritius has many rare and unique animals, such as the snakes, parrots and lizards. The giraffe is a type of animal with a very long neck and legs and yellow skin with dark spots. It is the tallest of all living animals.

Mauritius was extremely poor when it declared its independence in 1968. In the past ten years, obvious economic prosperity (繁荣) has shown itself in this island country. Nowadays its business, culture and tourism are developing rapidly. Every year, thousands of millions of people rush there to enjoy the silver sad beach and song and dance performances with native national characters.

小题1:The underlined word “relinquished” in the third paragraph means _______.

A.took its place

B.gave it up

C.left for it

D.held it out小题2:The right order that shows the history of Mauritius should be _______.

a. seized by the French          b. became its master

c. ruled by the Dutch            d. conquered by the British

A.b, a, c, d

B.a, c, d, b

C.d, c, a, b

D.c, a, d, b小题3: According to the passage all of the following statements are TRUE except ________.

Arable land covers 90% of the country’s total area   

It was the rule of foreigners that made the Mauritius people live in poverty

More than half of Mauritius population are Indians

Britain ruled the island longer than French and Dutch

填空题