随着经济的发展，能源与环境成为人们日益关注的问题。

（1）煤、_______和_______常称为三大化石燃料。

（2）燃煤发电时，将煤块粉碎成煤粉，其目的是_______。

（3）化石燃料燃烧都会产生二氧化碳，它是空气中含量最多的温室气体。为减少它的排放，科学家致力于研究将过多的二氧化碳和氢气在催化剂和加热的条件下反应，转化为水和甲烷。该反应的化学方程式为____________。

（4）“绿色化学”的特点之一是“零排放”。一定条件下，二氧化碳和氢气可以按照不同比例反应，生成下列有机物。其中二氧化碳和氢气反应，只生成一种产物就能实现“零排放”，这种产物是_______（填字母序号，下同）。

A．甲醇（CH₄O） B．甲酸（CH₂O₂） C．乙醇（C₂H₆O） D．乙酸（C₂H₄O₂）

（5）下列措施中，有利于降低大气中二氧化碳含量的是_______。

A．大量使用化石燃料 B．植树造林，增大植被面积 C．将二氧化碳变废为宝，循环利用

先阅读短文，再在其后空白处写出各单词的正确形式。单词的第一个字母已给出。

In 1993, Greg Mortenson took a trip to Pakistan to climb K2, the second tallest mountain in the world. On his way down the mountain, he got l (小题1:). Food and water were hard to find, but Mr. Mortenson found a small village. The people there saw that he was in n (小题2:) and helped him.  While in the village, Mr. Mortenson w(小题3:) the children write in the dirt for their school l(小题4:)．The village did not have money to build a school or pay for a t(小题5:)，Before he left, Mr.， Mortenson volunteered to r(小题6:) to the village and help them build a school

Mr. Mortenson went back to the US and wrote to many rich people. He asked them to d (小题7:) money to build a bridge and a school for the village. The I (小题8:) did not work very well, but at last e (小题9:) people heard about Mr. Mortenson’s plan and helped him. That was the beginning of the Central Asia Institute, an organization that has succeeded in building or helping to build more than 130 schools in small villages in Pakistan and Afghanistan With the help of journalist David Relin, Mr. Mortenson wrote the famous book Three Cups of Tea. It is about his work with villages in Pakistan and Afghanistan. Some people have criticized him, however, Mr. Mortenson was given a p(小题10:) in 2009 by the government of Pakistan for his work in the country.