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2 năm trước
Một HCN có chiều dài gấp 3 lần chiều rông, khi tăng chiều rộng thêm 48m thì được một HCN mới có chiều dài vẫn gấp 3 chiều rộng. Tính diện tích HCN ban đầu.
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IV. Supply each blank with one suitable word. (15pts) FADING MEMORIES The instamatic camera was invented in 1963 and the mass marketing of colour film followed shortly after. Until then, almost (1)……………….photographs had been in black and white. (2)…… the early 1970s, sales of color film had overtaken those for black and white and today color accounts (3)………..all but a tiny percentage of the 96 million films sold in Britain every year. But those early color photographs are already showing (4)……………of age. Millions of snapshots (5)……………since 1963 are changing colour because of their chemical make (6)………….. . These chemicals change over time. The deterioration of photographs is nothing new, of course. We tend (7)……………view the late nineteenth century in delicate shades of brown thanks to the chemicals used at the time. But (8)………… is a fair chance that future generations will (9)……. back at the late twentieth century as the era of purple grass and pink skies. Because, (10)………. the fading is only gradual, the different colors change (11)…………..different rates. Keeping photographs in a dark drawer, (12)…………. even in the fridge, will certainly (13)…….them last longer, but none of (14)…………..will keep forever. Our grandparents’ old-fashioned black and white photographs from earlier in the twentieth century will (15)……… the test of time better, in fact.

V. Rewrite the following sentences so that the meaning stays the same. 1. Jakarta doesn’t have as many skyscrapers as Shanghai. (fewer) → Shanghai ................................................................................................................ 2. You forgot to turn off the T.V last night, didn’t you? (did) → You didn’t remember ............................................................................................? 3. The countryside doesn’t suffer as much pollution as the city. (less) → The countryside..................................................................................................... 4. I think you should go to work by bike. → Why don’t .............................................................................................................? 5. New York has more billionaires than Tokyo. (than) → Tokyo ................................................................................................................... 6. We will plant more trees along this street. (by) → More trees ............................................................................................................. 7. Does overpopulation cause a lot of social problems in this area? (it) → Overpopulation .....................................................................................................? 8. Is pollution the most serious problem? (isn’t) → Pollution is ............................................................................................................? 9. A group of foreigners visited the slums last week, didn’t they? (visit) → Did ........................................................................................................................? 10. Mr Lam lived in the country when he was a child. (to) → Mr Lam used ..................................................................................................

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