Cho 14 gam bột Fe vào bình chứa 200 ml dung dịch NaNO₃ 0,5M và HCl 2,5M. Sau khi kết thúc các phản ứng, thêm tiếp lượng dư dung dịch AgNO₃vào bình, thu được m gam rắn không tan. Biết khí NO là sản phẩm khử duy nhất của NO₃^-. Giá trị của m là

A. 98,45

B. 104,35

C. 109,55

D. 112,15

Read the following passage and mark the letter A, B, c, or D on your answer sheet to indicate the correct answer to each of the questions from 43 to 50

Pollution emitted in industrial areas represents a threat to human health and the surrounding natural resources. We have a tendency to believe that the production processes are the only source of environmental damage, and often forget about the possible long-term effects of harmful production practices. We may think that the closure of these huge industrial areas would improve the quality of the environment. Unfortunately, this ignores the threat of the remaining waste, which is abandoned and poorly stored. It represents an even bigger danger because it stands neglected as it degrades and leaks into the earth without any control at all. 

Changes in the water chemistry due to surface water contamination can affect all levels of an ecosystem. It can affect the health of lower food chain organisms and, consequently, the availability of food up through the food chain. It can damage the health of wetlands and damage their ability to support healthy ecosystems, control flooding, and filter pollutants from storm water runoff. The health of animals and humans are affected when they drink or bathe in contaminated water. In addition water-based organisms, like fish and shellfish, can pile up and concentrate contaminants in their bodies. When other animals or humans eat these organisms, they receive a much higher dose of contaminant than they would have if they had been directly exposed to the original contamination. 

Contaminated groundwater can badly affect animals, plants and humans if it is removed from the ground by manmade or natural processes. Depending on the study of rocks of the area, groundwater may rise to the surface through springs or seeps, flow sideways into nearby rivers, streams, or ponds, or sink deeper into the earth. In many parts of fhe world, groundwater is pumped out of the ground to be used for drinking, bathing, other household uses, agriculture, and industry. 

Contaminants in the soil can harm plants when they take up the contamination through their roots. Eating, breathing in, or touching contaminated soil, as well as eating plants or animals that have piled up soil contaminants can badly affect the health of humans and animals. 

Air pollution can cause breathing-related problems and other bad health effects as contaminants are absorbed from the lungs into other parts of the body. Certain air contaminants can also harm animals and humans when they contact the skin. Plants rely on breathing for their growth and can also be affected by exposure to contaminants moved in the air

Which of the followings has the closest meaning to the word “absorbed” in the last paragraph?

A. Consumed   

B. Taken in   

C. Swallowed   

D. Piled up

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the question below.

The countryside of Britain is well known for its beauty and many contrasts: its bare mountains and moorland, its lakes, rivers and woods, and its long, often wild coastline. Many of the most beautiful areas are national parks and are protected from development. When British people think of the countryside they think of farmland, as well as open spaces. They imagine cows or sheep in green fields enclosed by hedges or stone walls, and fields of wheat and barley. Most farmland is privately owned but is crossed by a network of public footpaths.

Many people associate the countryside with peace and relaxation. They spend their free time walking or cycling there, or go to the country for a picnic or a pub lunch. In summer people go to fruit farms and pick strawberries and other fruit. Only a few people who live in the country work on farms. Many commute to work in towns. Many others dream of living in the country, where they believe they would have a better and healthier lifestyle.

The countryside faces many threats. Some are associated with modern farming practices, and the use of chemicals harmful to plants and wildlife. Land is also needed for new houses. The green belt, an area of land around many cities, is under increasing pressure. Plans to build new roads are strongly opposed by organizations trying to protect the countryside. Protesters set up camps to prevent, or at least delay, the building work.

America has many areas of wild and beautiful scenery, and there are many areas, especially in the West in states like Montana and Wyoming, where few people live. In the New England states, such as Vermont and New Hampshire, it is common to see small farms surrounded by hills and green areas. In Ohio, Indiana, Illinois and other Midwestern states, fields of corn or wheat reach to the horizon and there are many miles between towns.

Only about 20% of Americans live outside cities and towns. Life may be difficult for people who live in the country. Services like hospitals and schools may be further away and going shopping can mean driving long distances. Some people even have to drive from their homes to the main road where their mail is left in a box. In spite of the disadvantages, many people who live in the country say that they like the safe, clean, attractive environment. But their children often move to a town or city as soon as they can.

As in Britain, Americans like to go out to the country at weekends. Some people go on camping or fishing trips, others go hiking in national parks. 

Which of the following is NOT mentioned as an activity of relaxation in the countryside of Britain?

A. Riding a bicycle

B. Going for a walk 

C. Going swimming 

D. Picking fruit

Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.

A. competitor                

B. medal               

C. level                 

D. development

Mark the letter A, B, C or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions

A. books     

B. keeps 

C. laughs     

D. plays

Ở một loài thực vật, A quy định hoa đỏ là trội hoàn toàn so với a quy định hoa trắng. Sử dụng cônsixin để gây đột biến hợp tử Aa, sau đó cho phát triển thành cây F₁. Cho F­₁ giao phấn ngẫu nhiên với nhau, thu được F₂. Biết rằng cơ thể tứ bội giảm phân tạo ra giao tử lưỡng bội có khả năng thụ tinh bình thường. Theo lí thuyết, có bao nhiêu phát biểu sau đây đúng?

(1) F₂ có số cây hoa đỏ chiếm tỉ lệ 35/36.

(2) F₂ có 12 loại kiểu gen.

(3) Toàn bộ các cây hoa trắng ở F₂ đều có kiểu gen giống nhau.

(4) F₂ có 9 kiểu gen quy định kiểu hình hoa đỏ.

A. 2.

B. 3.

C. 1.

D. 4.

Trong quá trình ôn thi THPT Quốc Gia môn Sinh học, một học sinh khi so sánh sự giống và khác nhau giữa các đặc điểm gen nằm trên nhiễm sắc thể thường và gen nằm trên nhiễm sắc thể giới tính ở ruồi giấm đã lập bảng tổng kết sau:

Số thông tin mà học sinh trên đã nhầm lẫn khi lập bảng tổng kết là

A. 3         

B. 6

C. 4

D. 5