问题 填空题

“西气东输”工程对我市经济建设具有重大意义。“西气东输”工程输送的是当今世界上最重要而又较洁净的气体化石燃料--天然气。

请你回答:

(1)天然气的主要成分是__________(填化学式)。

(2)煤矿有时会发生瓦斯爆炸事故,瓦斯的主要成分与天然气相同,写出瓦斯爆炸的化学方程式:______________________________________________。

(3)另据报导,在我国南海、东海海底发现巨大的“可燃冰”带,“可燃冰”(CH4· nH2O)是由天然气和水在高压低温条件下形成的冰态物。若将天然气从其冰态物中分离出来,有两种方法:

①在一定温度下,________________使气体从冰态物中分离出来;

②在一定压强下,________________使气体从冰态物中分离出来。

(4)化石燃料等不可再生能源将日趋枯竭,我们在使用能源时应树立“一要节约能源,二要进一步开发、利用新能源”的观点。

①下列各图中表示我国节能标志的是___________。

②有待继续开发、利用的能源有(至少写两种)_________________________。

③用化学方程式表示出一个化学能转化为热能的例子____________________。

④请举出一个生产、生活中电能转化成化学能的例子__________________________。

答案

(1)CH4

(2)CH4+2O2CO2+2H2O

(3)①降低压强(或降压)②升高温度(或升温)

(4)①C②太阳能、氢能、核能、风能、地热、潮汐能等(任写两个即可给分)③C+O2CO2(放热反应均可)④电池充电或电解水等

填空题
阅读理解

阅读理解。

   Harvard University is on the both sides of the Charles River. The oldest institution

of higher learning in the United States was founded in 1636. In 1638 it was named for John

Harvard, its first founder. During the 1640s the college was enlarged although it was short

of money. Meant to be an institution for the education of Puritan ministers (清教牧师),

it grew to be an institution of general education (普通教育), and new and more subjects and

policies (政策) were introduced. In the 18th century, particularly under John Leverett

(1708-24) the number of the students and campus equipment increased while the religious (宗

教的) color decreased. In its early years, the college was largely supported by the English

colony and the New England community as a whole, but support soon came in the form of gifts,

and in 1823 the state money was received for the last time. Under Charles W. Eliot, the

college became a great modern university. Its basic courses improved and enlarged, the

graduate school was set up for those who finished their four-year undergraduate study, and

the law and medical schools were reorganized. Eliot is also famous for his introduction

of the elective system at Harvard. Besides Harvard College, the university includes schools

of divinity (1816), law (1817), arts and science (1872), education (1920), engineering (1935),

reorganization of Lawrence Science School of l847, public administration (1935). Harvard also

has schools of business administration (1908), medical (1782), public health (1922), and dental

health (1941). Radckiffe college for women is connected with Harvard; its students are

taught by Harvard professors and receive diplomas given by Harvard. The university 1ibrary,

among the nation's finest, houses over 8 million volumes and the Fog Museum of Art is one

of the finest university museums in the world. Harvard is closely connected with a large

number of research institutions as well.

1. Harvard University _____. [ ]

A. has a history of more than 450 years

B. was enlarged in the middle of the 17th century

C. was first meant to be an institution for general education since its foundation

D. was founded by John Leverett

2. 0ne of John Leverett's greatest contributions to Harvard University is most probably

   that _____.[ ]

A. he set up Harvard University

B. he freed Harvard University from the support of the state

C. he made Harvard a Puritan university

D. he helped develop general education in Harvard University

3. Which of the following statements might NOT be true about Charles W. Eliot? [ ]

A. Under his leadership, Harvard University became a modern university.

B. He introduced the elective system at Harvard University.

C. He improved and enlarged Harvard University, making it a modern university.

D. He tried hard to reduce the religious color of Harvard University.

4. Based on the passage, between 1816 and 1941 Harvard _____.[ ]

A. had at least 10 more schools added up to it

B. founded Lawrence Science school

C. went through a period of slow progress

D. reorganized Harvard College

5. Which of the following statements is true about Harvard University according to the

    passage?[ ]

A. Harvard is a large and modern university with a long history.

B. Harvard has the world's finest library with its 8 million of books.

C. Harvard University has the nation's best art museum.

D. Radcliffe College for men is one of the schools of Harvard University.