[单项选择](Alike) other forms of energy, natural gas (may be used) to (heat) homes, cook food, and even (run) automobiles.（）
A. Alike
B. may be used
C. heat
D. run

[简答题]
1. Much of the world gets its energy from fossil fuel sources, including coal, oil, and natural gas, all of which were created millions of years ago.The process began with dead plant and animal matter that collected and over time was buried deep within the earth. There, exposed to extreme pressure and temperatures, the carbon-based material underwent various chemical and physical changes. Some of it became coal, some oil, and some natural gas, depending on the exact conditions it was subjected to.
2. Natural gas is both invisible and odorless. During the first century of the fossil fuel era, it was disregarded as a worthless byproduct of coal and oil. However, people later discovered that it could also be a useful source of energy, and they set about trying to realize its potential. Its use began to grow in the twentieth century and has increased rapidly within the last 40 years. Nowadays, natural g

[单项选择]
1. Much of the world gets its energy from fossil fuel sources, including coal, oil, and natural gas, all of which were created millions of years ago.The process began with dead plant and animal matter that collected and over time was buried deep within the earth. There, exposed to extreme pressure and temperatures, the carbon-based material underwent various chemical and physical changes. Some of it became coal, some oil, and some natural gas, depending on the exact conditions it was subjected to.
2. Natural gas is both invisible and odorless. During the first century of the fossil fuel era, it was disregarded as a worthless byproduct of coal and oil. However, people later discovered that it could also be a useful source of energy, and they set about trying to realize its potential. Its use began to grow in the twentieth century and has increased rapidly within the last 40 years. Nowadays, natural gas i
A. remain mostly hidden.
B. share similar origins.
C. are found deep underground.
D. can be hard to tell apart.

[简答题]Riterate Energy (公司名) offers you natural gas at a lower "fixed rate". In fact, based on current rates an average homeowner can save up to $100 a year by choosing RiteRate. Plus, if you sign up online, or participate in our RiteRate Partner Program, you can save even more money. Our website is www.riterate.com.

[填空题]Advertising is distinguished from other forms of communication __________________(因为广告商要为传递的广告信息付钱).

[单项选择]Advertising is different from other forms of communication in that the advertisers pay for the message to be delivered．
A. 广告与其他的交际方式不同，因为发布广告的人要为所传递的信息付出代价。
B. 广告与其他的交际方式不同，因为发布广告的人要为所传递的信息支付费用。
C. 广告同其他的通信方式不同，因为发布广告的人要为所传递的信息支付费用。
D. 广告与其他的通信方式不同，因为发布广告的人要为所传递的信息付出代价。