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 fr...

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 636 to 640.

The concept of urban farming, growing food in cities, has gained significant traction in recent years. With increasing populations and limited space, traditional agriculture is facing challenges in meeting the demand for fresh produce. Urban farming offers a potential solution by utilizing rooftops, vertical spaces, and even abandoned buildings for cultivation.

One popular method is hydroponics, where plants are grown without soil in nutrient-rich water solutions. This method allows for efficient use of space and water, making it ideal for urban environments. Another approach is aquaponics, which combines aquaculture raising fish and hydroponics. The fish waste provides nutrients for the plants, creating a symbiotic ecosystem.

Urban farms not only contribute to food security but also offer numerous environmental benefits. They reduce the carbon footprint associated with transporting food from rural areas to cities. Additionally, they can help mitigate the urban heat island effect by providing cooling vegetation. Furthermore, urban farming can foster community engagement and education about sustainable food practices.

However, challenges remain. Setting up and maintaining urban farms can be costly, and expertise in specialized techniques like hydroponics and aquaponics is required. Additionally, ensuring consistent production and distribution can be complex. Despite these challenges, the potential benefits of urban farming make it a promising approach to addressing food security and environmental sustainability in urban areas.

Adapted from English 12 – Global Success

Trả lời cho các Câu 636, 637, 638, 639, 640 dưới đây:

Câu 636:   

What does "this method" in paragraph 2 refer to?

A. Traditional agriculture

B. Urban farming

C. Hydroponics

D. Aquaponics