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Đáp án: B
Giải thích: made to investigate = make an attempt to do st.
Dịch: Tuy nhiên, rất ít nỗ lực được thực hiện để nghiên cứu hiện tượng này một cách khoa học.
The roller -coaster has been around for over one hundred years and...its...(1)popularity is constantly increasing.
Some people....are....(2) crazy about roller - coasters and travel around.....the....(3) world to try out new rides famous...for...(4) their speed ,length or height.They love the feeling of not being...under....(5) control,the speed and the 'sickening' feeling in...their...(6) stomach at the top of the first place.
Some roller-coasters are made of pine ....frame....(8).These rides feel .....not....(9) safe because the track shakes and makes a lot of noise. As a result the rides seem ....very....(10) dangerous. However,they are just....as...(11)
safe as steel frame ones.
about twenty percent of the world's present energy comes from the sun in one form or another. Special devices have already been made available to put on the roofs of houses and flats to catch the sun's rays and thus heat water. Thousands of these devices are now being used to provide energy in homes throughout the United States while more than a million solar water-heating units have already been built in homes in Japan. Other purposes for which solar energy is at present, being used include the separation of salt from seawater, irrigation and sewage disposal. For most people in developing countries, the need is not air-conditioners or central heating, but for cheap ways of cooking food, drying crops, and lighting homes.
1.what have people made to help houses and flats to catch the sun's rays?
They have put special devices on the roofs of houses and flats to catch the sun's rays
2.where have people built more than a million solar water-heating units?
In the USA
3.is the solar energy being used to remove salt from seawater at present?
Yes, it is
4.what do people in developing countries need?
They need cheap ways of cooking food, drying crops, and lighting homes.
