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trangtyterw
2 năm trước
Cho kí hiệu nguyên tử của nguyên tố X như sau: 35/17 Y. Hãy cho biết : Số proton, số nơtron, số electron, số hiệu nguyên tử, số khối, điện tích hạt nhân, tổng số hạt mang điện, số hạt không mang điện, số hạt mang điện trong nhân có trong nguyên tử nguyên tố X.
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2. Read the text and choose the correct answer. If you enjoy cycling for pleasure, doing it in London can be a shock. There are not enough lanes especially for bike, and making your way through the traffic can be very risky. But if you have great passion, cycling in London can be exciting, and it is an inexpensive way of keeping fit if you live there. Some cyclists don't mind spending a lot of money on expensive bikes. However, if you just want a basic bike that is only for occasional use, there are many cheap choices. Several markets have cheap bike on sale which may not be inpressive to look at but should be satisfactory. You should buy a cycling helmet if you want to cycle in London. Wearing a cycling helmet is not compulsory in Britain, but it is a good idea to wear on for protection. 1. What is the main idea of the passage? A. Cycling helmets B. Cheap bicycles C. Bicycle markets D. Cycling in London 2. According to the passage, cycling in London is: A. easy B. difficult C. tiring D. boring 3. The word "it" in line 3 refers to: A. cycling B. passion C.excitement D. doing exercise 4. The difficulty of cycling in London is described in lines: A.2 B.5 C.5-6 D.8-9 5. According to the passage, all the followings are true EXCEPT that A. It is compulsory to wear a helmet when cycling in Britain. B. Some bikes in London are cheap. C.There are not many lanes expecially for bikes. D. Some cyclists don't want to buy expensive bikes.

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