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Thể tích không khí (chứa 20% thể tích O2) (đktc) cần dùng để đốt cháy hết 8 gam khí CH4 là * 448 lít 112 lít 11,2 lít 22,4 lít
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1. Australia has the biggest _______ in the world. A.natural beauty B.puzzling games C.cattle station 2. Over 1,000 sea planes come and go on the water of Lake Hood airport in Alaska. It’s really a fun _______ to watch. A.scene B.icon C.puzzle 3. The Maori’s language and _______ have had a great impact on New Zealand life. A.festivals B.dances C.culture 4. Niagara Falls is a great _______ on the border of the USA and Canada. Thousands of visitors come to see it every month. A.tradition B.spectacle C.relaxation 5. People in countries like the USA, Great Britain, and New Zealand use English as their _______ language. A.official B.native C.foreign 6. In summer, children often take part in a local or international _______ A.summer camp B.game C.attraction 7. Alaska, a state in the USA, _______ both the Arctic Ocean and the Pacific Ocean. (face) A.faces B.is facing C.has faced 8. In Adelaide, south of Australia, the sun _______ until 9 p.m in summer. (not/ set) A.isn't setting B.hasn't set Cdoesn't set 9. Although England has several good football teams, it _______ the World Cup only once. (win) A.wins B.has won C.won 10. The government of New Zealand _______ a lot to preserve the culture of the Maori, the native people of this land. (do) A.does B.is doing C.has done 11. In Canada, the serving of coffee at the end of an evening _______ a signal that it is time for visitors to leave. (be) A.was B.is C.has been 12. In many cultures, it’s considered rude if you push through people who _______ to get out of a bus or a train. (try) A.are trying B.try C.has tried 13. Australia is home to a variety of ___________ animals, including the koala, kangaroo, emu, kookaburra and platypus. A.useful B.unique C.official 14. Canada is rich in _______________ such as zinc, nickel, lead and gold. A.languages B.symbols C.resources 15. The US is a _____________ country with a multicultural society. A.rich B.diverse C.beautiful 16. In Singapore, the number of ______________ speakers of English is still rising. A.official B.unique C.native 17. The American bald eagle was chosen as the national bird ___________ of the United States in 1782. A.symbol B.animal C.beauty 18. English and Welsh are the two ______________ languages of Wales. A.native B.optional C.official 19. The world’s largest reef system, the Great Barrier Reef, is found off the north-eastern coast of ______________. A.America B.New Zealand C.Australia 20. Residents from Liverpool speak English__________ a different accent. A.with B.as C.on D.under

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