Một dây dẫn thẳng dài vô hạn đặt trước không khí mang dòng điện I1=4A a.xác định cảm ứng từ tại M cách đây dẫn 10cm b.thay dòng điện I1 bằng dòng điện I2 có cường độ nhỏ hơn I1 chạy qua dây dẫn trên thì cảm ứng từ tại M thay đổi một lượng 1,5.10^-6T.tính cường độ dòng điện I2

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Câu 31.A.carefully B.carelessly C.careless D.careful Read the passage, and then choose the correct answers. Tokyo is the capital of Japan. In Tokyo, there are always too many people in the place where you want to come. People are very polite even when they often spend a long time on the traffic jams. Tokyo is different from London when you want to walk to a place. During the day, most people travel to work by train. Tokyo people buy six million train tickets every day. Although they are usually crowded , Japanese trains are very good. They always leave and arrive on time. On a London train, everybody in a seat seems to be asleep, whether the journey is long or short. The worst time to be in the street at night is about 11.30 when the nightclubs are closing and everybody wants to go home. Câu 32.Tokyo is different from London because____________. A.it has a larger population B.it is a noisy city C.it is more difficult to walk to somewhere D.its people are friendly and more polite Câu 33.When does the writer think the worst time to go into the street? A.When the nightclubs are closing. B.At 8.00 am. C.When the trains are full D.at 11.30 am Câu 34.What does the writer think of Japanese trains? A.They are very nice and comfortable. B.There are not enough trains. C.They often run late D.They leave and arrive on time. Câu 35.In London trains, every British in a seat ________. A.read a newspaper B.looks like being asleep C.talks with other people D.looks out of the window. Câu 36.Which statement is NOT true according to the passage? A.Most people in Tokyo travel to work by train. B.It is very difficult to go around in Tokyo. C.When Japanese people are on traffic jams, they are not polite. D.Trains in Tokyo are very good –they always leave and arrive on time. Choose the answer (A,B,C or D) which is the same meaning as the first one. Câu 37.Peter is more intelligent than any other student in the class. A.Peter is the most intelligent student in the class. B. Peter is a most intelligent student in the class. C.Peter is the more intelligent student in the class. D.Peter is not the most intelligent student in the class. Câu 38.Cities are convenient, but the air in cities is polluted. A. Although cities are convenient, but the air in cities is polluted B.Because cities are convenient, but the air in cities is polluted C.Although cities are convenient, the air in cities is polluted D. Cities are convenient because the air in cities is polluted Write complete sentence, using the words given Câu 39.My father / not/ go fishing/ last weekend. A.My father didn’t went fishing last weekend. B. My father didn’t go fishing last weekend. C.My father wasn’t went fishing last weekend. D.My father wasn’t go fishing last weekend. Make question for the underlined part Câu 40.Minh goes to the karate club three times a week. A.Why does Minh go to the karate club? B.How does Minh go to the karate club? C. How often does Minh go to the karate club? D. How many does Minh go to the karate club?

Câu 21.I like __________,so I will save money to buy a good bicycle. A.jogging B.swimming C.cycling D.skiing Câu 22.Children like cartoons,__________they are funny. A.because B.but C.or D.so Choose the underlined word/phrase whose underlined part (A,B,C or D) is pronounced differently from the others Câu 23.Everest is highest mountain in the whole world. A.is B.highest C.in D.whole Câu 24.Did you watched the football match on TV last night? A.watched B.the C.on D.last Câu 25.Hoa will gets lucky money from her grandparents. A.will B.gets C.from D.her Câu 26.Alex can play the guitar when he was eleven years old. A.can B.play C.when D.years Read the passage and decide which answer A,B,C or D best fits each space. Our future house will be on the ocean. It will be surrounded by tall trees and blue sea. But we only have salt water in the ocean. We need fresh water for (27)_____and for growing food (28)______farms. Ocean water is too salty (29)_______. It is also too salty for watering plants. We must have the (30)________to make fresh water from salty water. We should be (31)_____ not to waste water. Câu 27.A.to drink B.to drinking C.drink D.drinking Câu 28.A.into B.at C.in D.on Câu 29.A.drink B.for drink C.drinking D.to drink Câu 30.A.ideas B.ways C.suggestions D.things

Câu 3: Trộn 5 ml rượu etylic (cồn) với 10 ml nước cất. Phát biểu nào dưới đây đúng? A. Chất tan là rượu, dung môi là nước. B. Chất tan là nước, dung môi là rượu. C. Nước hoặc cồn có thể là chất tan hoặc dung môi. D. Cả hai chất nước và cồn vừa là chất tan vừa là dung môi.

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Nêu vị trí giới hạn hình dạng lãnh thổ Việt Nam. Vị trí địa lý và hình dạng lãnh thổ nước ta có thuận lợi khó khăn gì trong việc phát triển kinh tế xã hội

biểu hiện của hiện tượng ưu thế lai

Cho khối chóp tam giác đều S.ABC có cạnh đáy bằng a và cạnh bên bằng 2a. Tính khoảng cách từ S đến mặt phẳng (ABC)

Ở trạng thái bình thường thì nguyên tử? a) Mang cả hai loại điện trên b) Mang điện tích dương c) Không mang điện d) Mang điện tích âm