英语四级阅读理解专项训练答案（7）

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The importance of water

Water is an essential resource for life on Earth. It is a fundamental element of human survival and development, as well as being crucial for maintaining the ecological balance. However, the importance of water is often taken for granted, especially by the younger generation. In this article, we will explore the various roles of water in our lives and why it is so important.

Firstly, water is essential for human survival. The human body is made up of approximately 60% water, which is necessary for maintaining normal bodily functions. Water is involved in regulating body temperature, lubricating joints, and protecting vital organs. When we become dehydrated, our bodies begin to malfunction, leading to a range of health problems.

Secondly, water plays a crucial role in agriculture and food production. Farmers rely on water to irrigate crops, allowing for the production of food and other agricultural products. The lack of water can lead to droughts and famines, causing widespread food shortages and human suffering.

Thirdly, water is essential for maintaining the ecological balance. It is a crucial component of the hydrological cycle, which involves the evaporation of water into the atmosphere, its condensation into clouds, and precipitation as rain or snow. This cycle helps to regulate the temperature of the Earth and maintains the health of our planet's ecosystems.

Fourthly, water is necessary for industry and manufacturing. Factories use large amounts of water for cooling machinery, processing raw materials, and producing goods. The lack of water would result in industrial shutdowns and would hinder the production of essential goods.

Finally, water is important for our daily lives. We use water to cook food, clean ourselves, and maintain our personal hygiene. It is also used for heating and cooling our homes, as well as for recreation and entertainment purposes such as swimming and boating.

In conclusion, water is truly a valuable resource that we cannot do without. We must cherish and protect this essential element by ensuring its sustainable management and use. Otherwise, the consequences of its scarcity would be catastrophic for humanity and the planet as a whole.

Water makes up approximately what percentage of the human body?

A) 30%

B) 40%

C) 50%

D) 60%

What is the main function of water in the human body?

A) Regulating body temperature

B) Lubricating joints

C) Protecting vital organs

D) All of the above

What is the importance of water in agriculture and food production?

A) It provides irrigation for crops.

B) It allows for the production of food and other agricultural products.

C) It prevents droughts and famines.

D) All of the above

What is the role of water in maintaining the ecological balance?

A) It is a crucial component of the hydrological cycle.

B) It helps to regulate the temperature of the Earth.

C) It maintains the health of our planet's ecosystems.

D) All of the above

How is water used in our daily lives?

A) For cooking food and cleaning.

B) For heating and cooling our homes.

C) For recreation and entertainment purposes such as swimming and boating.

D) All of the above

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