As a result of pollution, Lake Erie, on the borders of the USA and Canada, is now without any living things. Pollutions in water are not simply a matter of “poisons” killing large numbers of fish overnight. Very often the effects of pollution are not noticed for many months or years because the first organisms to be affected are either plants or plankton. But these organisms are the food of fish and birds and other creatures. When this food disappears, the fish and birds die in this way a whole food chain can be wiped out, and it is not until dead fish and water birds are seen at the river’s edge or on the sea shore that people realize what is happening. Where do the substances which pollute the water come from? There are two main sources – sewage and industrial waste. As more detergent is used in the home, so more of it is finally put into our rivers, lakes and seas. Detergents harm water birds dissolving the natural substance which keep their feather waterproof. Sewage itself, if it is not properly treated, makes the water dirty and prevents all forms of life in rivers and the sea from receiving the oxygen they need. Industrial waste is even more harmful since there are many high poisonous things in it, such as copper and lead. So, if we want to stop this pollution, the answer is simple, sewage and industrial waste must be made clean before flowing into the water. It may already be too late to save some rivers and lakes, but others can still be saved if the correct action is taken at once.

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

According to the passage, the way to stop water pollution is ...........

Câu hỏi liên quan

• According to the passage, Melville’s early novels were__________.

• Faugel’s research showed that beta blockers given to his sample ...............

• Why did people name Cambridge the “city of Cambridge”?

ZUNIA12

• The first songs of the Beatles were ............

• The word “reluctant” in the third paragraph can best be replaced by ............

• Which of the following terms does the author define in the first paragraph?

• What does the author imply in the last sentence of the passage?

• According to the passage, when James Monroe came to the White House, it had been .......

• The word "excruciating" in the last paragraph means ________.

• According to the passage, in what way did the climate changes in the ice ages differ from the modern ones?

• Why does the couple exchange garlands?

• In the passage, which of the following is NOT true of the Internet?

• The word “reluctant” in line 13 can best be replaced by ________.

• From the passage we can infer that: .........

• The word “those” in paragraph 2 refers to __________.

• What does the passage mainly discuss?

• According to the writer, people should ______.

• The word “they” in line 17 refers to ...........

• According to the passage, an exuberant tone of voice may be an indication of a person’s ............

• According to the passage, some Americans choose to live in the country because ___.