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thanhhuyennct
2 năm trước
các bn giải giúp mik bài này đeef : cho tam giác ABC cân tại A ( góc A < 90• ). Vẽ BH vuông góc AC ( H Thuộc AC ) , CK vuông góc AB ( K thuộc AB ) a) C/m tam giác ABH=tam giác ACK b) Gọi I là giao điểm của BH và CK. C/m AI là tia phân giác của góc A c) C/m tam giác BIC cân
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Giúp em với ạ Em cảm ơn rất nhiều luôn ấy ạa I. Fill in the blanks with proper words, then answer the following questions. scientists/ pollution/ serious/ factories exhaust/ reduce/ require/ percentage Everyone wants to reduce (1) _______. But the pollution problem is as complicated as it is (2) _______. It is complicated because much pollution is caused by things that benefit people. For example, (3) _______ from automobile caused large (4) _______ of air pollution. But the automobile provides transportation to millions of people. (5) _______ discharge much of the material that pollutes air and water, but factories give employment to a large number of people. Thus, to end or greatly (6) _______ pollution immediately, people would have to stop using many things that benefit them. Most people do not want to do that, of course. But pollution can be gradually reduces in several ways, (7) _______ and engineers can work to find ways t lessen the amount of pollution that such things as automobiles and factories cause. Government can pass and enforce laws that (8) _______ businesses and individuals to stop, or cut down on certain polluting activities. Questions: 1)Do things that benefit people bring about pollution?  ………………………………………………………………………………………………………………… 2)Is it complicated to reduce pollution? Why or Why not?  ………………………………………………………………………………………………………………… 3)Who can find ways to lessen the amount of pollution?  ………………………………………………………………………………………………………………… 4)What can the Government do to reduce pollution?  ………………………………………………………………………………………………………………… II. Complete each sentence of the following letter. Dear Mr. Smith, 1. I write/ complain/ dirt/ smoke/ come/ your factory chimneys.  ………………………………………………………………………………………………………………… 2. Two days ago/ I decide/ do/ my washing.  ………………………………………………………………………………………………………………… 3. I wash/ sheets/ put/ out/ dry/ it/ be/ nice sunny day/ there/ be/ breeze.  ………………………………………………………………………………………………………………… 4. When I take washing in/ I be/ horrified/ discovered/ it/ cover/ dirty marks.  ………………………………………………………………………………………………………………… 5. I/ assume/ breeze/ I/ mention/ carry/ dirt/ chimneys.  ………………………………………………………………………………………………………………… This be/ not only/ because/ sheets/ but because/ we/ two small children/ who be make/ breathe/ same air.  ………………………………………………………………………………………………………………… Until this incident/ I think/ chimneys/ be safe/ clean.  ………………………………………………………………………………………………………………… 8. I already/ write/ local Member of Parliament/ this matter.  ………………………………………………………………………………………………………………… 9. Furthermore/ I must warn you/ I/ write/ local newspaper/ tomorrow.  ………………………………………………………………………………………………………………… I/ look forward/ receive/ reply.  …………………………………………………………………………………………………………………

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