Cho tam giác nhọn ABC, H là trực tâm, G là trọng tâm, O là giao điểm các đường trung trực của tam giác. Chứng minh rằng: H, G, O thẳng hàng và HG=2GO

trong tế bào của một loài thực vật lưỡng bội, xét 4 gen A,B,C,D, trong đó gen A nằm trên nst số 1, gen B nằm trên nst số 2

Câu 4. Đọc đoạn trích sau và xác định các kiểu câu .
+ Tôi bật cười bảo lão.
+ Cụ còn khoẻ lắm, chưa chết đâu mà sợ!
+ Cụ cứ để tiền ấy mà ăn, lúc chết hãy hay!
+ Tội gì bây giờ nhịn đói mà tiền để lại?
+ Không ông giáo ạ!
+ Ăn mãi hết đi thì đến lúc chết lấy gì mà lo liệu?

 một người bị cận thị có điểm cực cận cách mắt 15cm, điểm cực viễn cách mắt 2m. Hỏi đặt vật ở khoảng cách nào thì mắt ko nhìn rõ vật?

101. “We will visit this museum tomorrow.”
A. John said they would visit that museum the next day.
B. John said they will visit that museum the next day.
C. John said they would visit this museum tomorrow.
D. John said they will visit this museum the following day.
102. She doesn’t know the answer, so she cannot tell you.
A. If she doesn’t know the answer, she cannot tell you.
B. If she knows the answer, she can tell you.
C. Unless she knows the answer, she can tell you.
D. Unless she doesn’t know the answer, she cannot tell you.
103. You can have half of this pizza.
A. I’ll share this pizza with you.
B. I’ll share half of this pizza for you.
C. Half of this pizza can share to you.
D. Half of this pizza can be share to you.
104. If you are not careful, you’ll fall.
A. If you watch out, you’ll fall.
B. If you don’t watch out, you’ll fall.
C. Unless you don’t watch out, you’ll fall.
D. Unless you watch out, you will not fall.
105. I don’t think we’ll go to Scotland this year.
A. I think we shouldn’t go to Scotland this year.
B. I don’t think we shouldn’t go to Scotland this year.
C. I think we won’t go to Scotland this year.
D. I think we can’t go go to Scotland this year.
Mark the letter A, B, C, or D to indicate the correct sentence by using the given words 
106. They/ start/ campaign/ slow down/ process/ global warming/.
A. They started a campaign to slow down the process of global warming.
B. They start a campaign to slow down a process of global warming.
C. They started  the campaign to slow down a process of global warming.
D. They started a campaign to slow down the process about global warming.
107. the future / there / be / too many people / Earth.
A. In the future there will be too many people on Earth.
B. In future there will be too many people on Earth.
C. In the future there will  too many people on Earth.
D. In the future there are too many people on Earth.
108. If/ scientists/ continue/ explore/ universe/ they/ find/ new life forms?/
A. If scientists continue exploring the universe, will they find new life forms?
B. If scientists continue to explore universe, will they find new life forms?
C. If scientists continue to explore the universe, they will find new life forms?
D. If scientists continue to explore the universe, will they find new life forms?
109. there / be / significant climate changes / in the future ?
A. Will there be significant climate changes in the future?
B. Will there significant climate changes in the future?
C. Will there be significant climate changes in future?
D. There will be significant climate changes in the future?
110. as a result/ ice melting/ North and South Poles/ sea levels/ rise/.
A. As a result of the ice melting in North and South Poles, the sea levels are rising.
B. As a result of the ice melting in the North and South Poles, the sea levels rise.
C. As a result of the ice melting in the North and South Poles, the sea levels are rising.
D. As a result of the ice melting in the North and South Poles, the sea levels will rise.
111. international agreement/ climate change/ call/ Kyoto Protocol/.
A. The international agreement on climate change is call the Kyoto Protocol.
B. The international agreement on climate change is called the Kyoto Protocol.
C. An international agreement on climate change is call the Kyoto Protocol.
D. The international agreement about climate change is call the Kyoto Protocol.
112. Air pollution/ be/ serious problem/ especially/cities/.
A. Air pollution is a serious problem, especially in cities.
B. Air pollution is a serious problem, especially in the cities.
C. Air pollution will be a serious problem, especially in cities.
D. Air pollution to be a serious problem, especially in cities.
113. This/ submarine/ only/ go/deep/ 500 meters/.
A. This submarine only go to the depth of 500 meters.
B. This submarine only goes to deep of 500 meters.
C. This submarine only goes to the depth of 500 meters.
D. This submarine will only go to the depth of 500 meters.
114. some parts/ world/it/get/ hotter/ there/ not/ be/ rain/.
A. In some parts of world, it will get hotter and there won’t be any rain.
B. In some parts of the world, it gets hotter and there isn’t any rain.
C. In some parts of the world, it will get hotter and there not will be any rain.
D. In some parts of the world, it will get hotter and there won’t be any rain.
115. Mariana Trench/ deepest place/  Earth/  before now/ nobody/ ever / bottom/.
A. Mariana Trench is the deepest place on the Earth and before now nobody have ever been to the bottom.
B. The Mariana Trench is the deepest place on Earth and before now, nobody has ever been to a bottom.
C. Mariana Trench is the deepest place on the Earth and before now, nobody has ever gone to the bottom.
D. The Mariana Trench is the deepest place on the Earth and before now, nobody has ever been to the bottom.

khuyên bạn ko kiêu ngạo vì như thế là ko tốt nếu nó ko nghe đấm nó

1: Một chiếc xe đi từ A đến B với Vận tốc 50km/h và đi từ B đến A với vận tốc 70km/h. Biết thời gian đi nhiều hơn thời gian về 4 giờ. tính quãng đường AB 2: Lượng dầu của thùng thứ nhất ban đầu bằng 3535 lượng dầu của thùng thứ hai . Nếu chuyển 20 lít dầu từ thùng thứ nhất sang thùng thứ hai thì lượng dầu của thùng thứ nhất bằng 1313 lượng dầu của thùng thứ hai. tính lượng dầu mỗi thùng.