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Chất hữu cơ tạo thành khi thế 1 nguyên tử H trong phân tử khí Metan bằng 1 nguyên tử Clo có tên là: * Metyl clorua Điclo metan Hidro clorua Tetra clometan Cần gấp
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B> BÀI TẬP TUẦN 23 I. Fill in the blanks with proper words, then answer the following questions. power - effective - nuclear - advanced - pollution heat - stored - electricity - energy - panels Are you looking for a cheap, clean, (1) ________ source of power that doesn't cause (2) ________ or waste natural resources? Look no further than solar (3) ________ from our Sun. At present, most of our (4) ________ comes from the use of coal and gas, oil or (5) ________ power. This power could be provided by the Sun. one percent of the solar energy that reaches the Earth is enough to provide (6) ________ for the total population. Many countries are already using solar energy. Solar (7) ________ are placed on the roofs of a house and the Sun's energy is used to (8) water. The energy can be (9) ________ for a number of days, so on cloudy days you can use solar energy, too. Sweden has an (10) ________ solar energy program. There, all buildings will be heated by solar energy and cars will use solar power instead of gas by the year 2015. 1) Is the solar energy an efficient source of power? ............................................................................. 2) Where are the solar panels placed? ............................................................................. 3) How long can the energy be stored? ............................................................................. 4) Is the solar energy used in Vietnam now? ............................................................................. C> BÀI TẬP TUẦN 24 I. Join each of the following pairs of sentences with "or, and, but, so or because" 1. I told a joke. Nobody laughed. ............................................................................. 2. You must study harder. You will go into another class. ............................................................................. 3. The city suffers from air pollution. The city suffers from water pollution. ............................................................................. 4. I knew her family. I did what I could for her. ............................................................................. 5. We can't afford energy - saving light bulbs. The light bulbs are too expensive. ............................................................................. II. Complete the sentence with the one word given below. One word can be used for more than one sentence: for/ up/ after/ on/ off/ away/ in. 1. Who's going to look ______ the children while you're away? 2. "Turn ______ the TV for me, will you? I want to watch the cartoon. 3. She's looked ______ her keys everywhere. 4. Turn ______ the radio. I'm working. 5. If we go ______ littering, the environment will become seriously polluted. 6. Don't throw these newspapers ______. 7. Could you fill ______ this form? 8. Don't wake the baby ______. Let him sleep. 9. Don't believe her. She's just made ______ the story. 10. Susan took ______ her coat and put it on the sofa.

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