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2 năm trước
1. Biết phân tử đơn chất có cấu tạo: AA Khối lượng bằng gam cảu 5 phân tử trên là: 23,247 × 10 âm 23 (g) a. A là nguyên tố nào? b. Cho biết phân tử nhôm axit bao nhiêu lần.Biết phân tử nhôm oxi gồm 2Al liên kết 3 nguyên tử oxi GIÚP MIK BÀI TẬP NÀY VS Ạ
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Helpppppppppppppppppppppppppppppppppp meeeeeeeeeeeeeeeeeeeeeeeeeeeeeee II. Choose the correct word A, B, C or D for each gap to complete the following passage. WANGARI MAATHAI (1940-2011) Wangari Maathai understood how important trees are (1) ______ the future of the world ever since she was a little girl. Maathai (2) ______ up on a farm in Nyeri, in Kenya. She was very clever and studied at universities in the USA and Germany as well as in Kenya. In 1977, Maathai began a group in Kenya called the Green Belt Movement. Members of this group work hard to save their country’s forests, which are cut down by builders, farmers and people who need wood for cooking. With (3) ______ help of schoolchildren, they have planted more than 20 million trees in Kenya. Maathai took her message to other African countries and many Africans are now following her ideas. Maathai was (4) _______ around the world for her work and won (5) _______ international prizes. 1. A. with B. from C. into D. for 2. A. grows B. grown C. grew D. growing 3. A. a B. an C. the D. one 4. A. know B. knows C. knew D. known 5. A. many B. much C. more D. a lot III. Read the passage and do the following tasks below The University of Cambridge is a public university. It is located in Cambridge, the United Kingdom. It is regarded as the second oldest university (after the University of Oxford) in the United Kingdom and the third oldest surviving university in the world. The University of Cambridge was formed in 1290. Over the years, it is always considered to be one of the most prestigious institutions of higher education in the United Kingdom and the world. In 2012, the university was ranked second after Harvard in the United States of America. Today, Cambridge is a collegiate university with a student population of about 18,000. Its faculties, departments and 31 colleges occupy different locations in Cambridge. Graduates of the university have won a total of 65 Nobel Prizes, the most of any university in the world. A. Write (T) for True or (F) for false statement Statement True False 1. The University of Cambridge is located in the United States. 2. It is regarded as the second oldest surviving university in the world. B. Answer the following questions 1. When was the University of Cambridge formed? ___________________________________________________________________________________ 2. How many students are there today? ___________________________________________________________________________________ 3. Was it ranked before Harvard in the United States of America in 2012? _____________________________________________________________________________

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