TOEFL IBT Reading Practice Test 73 from The Collection of TOEFL Reading Comprehension
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Reading Directions: This section measures your ability to understand academic passages in English.
The Reading section is divided into separately timed parts.
Most questions are worth 1 point, but the last question for each passage is worth more than 1 point. The directions for the last question indicate how many points you may receive. You will now begin the Reading section. There are three passages in the section. You should allow 20 minutes to read each passage and answer the questions about it. You should allow 60 minutes to complete the entire section.
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The concept of obtaining fresh water from icebergs that are towed to populated areas and aired regions of the world was once treated as a joke more appropriate to cartoons than real life. But now it is being considered quite seriously by many nations especially since scientists have warned that the human race will outgrow its fresh water supply faster than it runs out of food.
Glaciers are a possible source of fresh water that have been overlooked until recently Three – quarters of the Earth’s fresh water supply is still tied up in glacial ice, a reservoir of untapped fresh water so immense that it could sustain ah the rivers of the world for 1,000 years. Floating on the oceans every year are 7, 659 trillion metric tons of ice encased in 10,000 icebergs that break away from the polar ice caps more than ninety percent of them from Antarctica.
Huge glaciers that stretch over the shallow continental shelf give birth to icebergs throughout the year. Icebergs are not like sea ice, which is formed when the sea itself freezes rather they are formed entirely on land, breaking off when glaciers spread over the sea. As they drift away from the polar region, icebergs sometimes move mysteriously in a direction opposite to the wind, pulled by subsurface currents. Because they melt more slowly than smaller pieces of ice, icebergs have been known to drift as far north as 35 degrees south of the equator in the Atlantic Ocean. To corral them and steer them to parts of the world where they are needed would not be too difficult.
The difficulty arises in other technical matters, such as the prevention of rapid melting in warmer climates and the funneling of fresh water to shore in great volume. But even if the icebergs lost half of their volume in towing, the water they could provide would be far cheaper than that produced by desalination, or removing salt from water.
1. What is the main topic of the passage?
(A) The movement of glaciers
(B) Icebergs as a source of fresh water
(C) Future water shortages
(D) The future of the world’s rivers
2. The word “it” in line 3 refers to
(A) an iceberg that is towed
(B) obtaining fresh water from icebergs
(C) the population of arid areas
(D) real life
3. According to the author, most of the world’s fresh water is to be found in
4. How are icebergs formed?
(A) They break off from glaciers
(B) Seawater freezes
(C) Rivers freeze
(D) Small pieces of floating ice converge
5. With which of the following ideas would the author be likely to agree?
(A) Towing icebergs to dry areas is economically possible
(B) Desalination of water is the best way to obtain drinking water
(C) Using water from icebergs is a very short -term solution to water shortages
(D) Icebergs could not be towed very far before they would melt
6. It can be inferred from the passage that most icebergs
(A) become part of glaciers
(B) drift toward the polar region
(C) move in whichever direction the wind is blowing
(D) melt in the oceans