-- we wait for you there? -- No, you . [ ] A. Need, mustn't B. Can, may not C. May, needn't D. Must, needn't 题目和参考答案——青夏教育精英家教网—

— Dad, must we wait until the light becomes green?

— Yes, I’m afraid we ______. That’s the traffic rule.

A. can B. may C. have to D. need

---Dad, must we wait until the light becomes green?

---Yes, I’m afraid we ______. That’s the traffic rule.

A．can B．may C．have to D．need

     In our lives, we enjoy everything from computers to cars to heated buildings. These comforts have
something in common: they all need energy to work. Energy has many different forms. One form, electricity,
comes mostly from steam-powered generators (蒸汽发电机). Steam is made by buming coal, oil, or natural
gas. Gasoline(汽油) is another form of energy. Casoline is made from oil. Oil has many other uses. Paints,
fertilizers, and plastics are made from it. We even use it to heat buildings. Coal, oil, and gas are natural
resources (资源). We take them from nature to make our lives easier.
     We can classify (分类) natural resources as either renewable or nonrenewable. Coal, oil, and gas are
nonrenewable. They take millions of years to form. Some scientists predict that we will run out of oil and
gas in 50 to 100 years. Coal is more plentiful. So it may last for hundreds of years. Resources such as wood
and water are renew- able. They can be grown or recycled naturally. They can, however, become limited
from overuse.
     We have developed some altemate (替代的) sources of energy. But these sources have disadvantages. For
example, hydroelectric power, or energy from running water, affects the ecology (生态) of surrounding areas.
Nuclear power (核电), another altemate source, presents the threat (威胁) of nuclear accidents. There are also
problems related to the storage (储存) of nuclear wastes. Solar and wind energies aren't consistent. We can't
depend on them. Geothermal energy, caused by heat from inside the earth, is tapped by drawing steam and
hot water from pools and geysers. This energy source, like most others, isn't fully developed.
     It's time to get serious about energy. We must find practical, alternate energy sources. If we wait too long,
it will be too late. We will run out of coal, oil, and natural gas. Then we won't have the resources to make
altemate energy sources.

1. Does oil have many uses?
    ________________________________________
2. How long may coal last according to the passage?
    ________________________________________
3. Why are wood and water renewable resources?
    ________________________________________
4. What can be problems with nuclear power?
    ________________________________________
5. What's the main idea of the passage?
    ________________________________________

用括号里的词的正确形式填空。

1. My grandpa is going to have her           (90) birthday.
2. We are looking for a student             (call)Tom.
3. While we           (wait) for the bus , a girl         (run) up to us.
4. -          you ever            (be) to Beijing?
     -Yes, I           (go) there last year.
5. We have problems                (work) out the maths problem?

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