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VI. Read the text then choose the best answer.
Water on the earth is being recycled continuously in a process known as the hydrologic
cycle. The first step of the cycle is the evaporation of water in the oceans. Evaporation is the
process of water turning into vapor, which then forms clouds in the sky. The second step is water
returning to the earth in the form of precipitation: rain, snow, or ice. When the water reaches the
earth’s surface, it runs off into the rivers, lakes, and oceans, where the cycle begins again.
Not all water, however, stays on the surface of the earth in the hydrologic cycle. Some of it
seeps into the ground through infiltration and collects under the earth’s surface as ground water.
This ground water is extremely important to life on earth, since 95% of the earth’s water is in the
oceans and it is too salty for human beings or plants. Of the 5% on land, only 0.5% is above ground
4
in rivers or lakes. The rest is underground water. This groundwater is plentiful and dependable
because it doesn’t depend on seasonal rain or snow. It is the major source of water for many cities.
But as the population increases and the need for water also increases, the groundwater in some areas
is getting dangerously low. Added to this problem is an increasing amount of pollution that seeps
into the groundwater. In the future, with a growing population and more toxic waste, the hydrologic
cycle we depend on could become dangerously imbalanced.
1. The main subject of this passage is
A. water conservation B. the hydrologic cycle
C. underground water D. polluted groundwater
2. The passage states that clouds are formed from
A. water vapor B. evaporation C. the hydrologic cycle D. groundwater
3. The phrase “run off” is most similar in meaning to which of the following?
A. escapes B. flows C. races D. solidifies
4. Groundwater
A. depends on seasonal rain B. comes from toxic waste
C. is 0.5% of all water D. collects under the earth
5. The word “collects” could best be replaced by
A. bunches B. bends C. arranges D. gathers
6. The amount of groundwater is
A. about 95% of all water B. less than 5% of all water
C. 0.5% of above-groundwater D. 95% of above-groundwater
Water on the earth is being recycled continuously in a process known as the hydrologic
cycle. The first step of the cycle is the evaporation of water in the oceans. Evaporation is the
process of water turning into vapor, which then forms clouds in the sky. The second step is water
returning to the earth in the form of precipitation: rain, snow, or ice. When the water reaches the
earth’s surface, it runs off into the rivers, lakes, and oceans, where the cycle begins again.
Not all water, however, stays on the surface of the earth in the hydrologic cycle. Some of it
seeps into the ground through infiltration and collects under the earth’s surface as ground water.
This ground water is extremely important to life on earth, since 95% of the earth’s water is in the
oceans and it is too salty for human beings or plants. Of the 5% on land, only 0.5% is above ground
4
in rivers or lakes. The rest is underground water. This groundwater is plentiful and dependable
because it doesn’t depend on seasonal rain or snow. It is the major source of water for many cities.
But as the population increases and the need for water also increases, the groundwater in some areas
is getting dangerously low. Added to this problem is an increasing amount of pollution that seeps
into the groundwater. In the future, with a growing population and more toxic waste, the hydrologic
cycle we depend on could become dangerously imbalanced.
1. The main subject of this passage is
A. water conservation B. the hydrologic cycle
C. underground water D. polluted groundwater
2. The passage states that clouds are formed from
A. water vapor B. evaporation C. the hydrologic cycle D. groundwater
3. The phrase “run off” is most similar in meaning to which of the following?
A. escapes B. flows C. races D. solidifies
4. Groundwater
A. depends on seasonal rain B. comes from toxic waste
C. is 0.5% of all water D. collects under the earth
5. The word “collects” could best be replaced by
A. bunches B. bends C. arranges D. gathers
6. The amount of groundwater is
A. about 95% of all water B. less than 5% of all water
C. 0.5% of above-groundwater D. 95% of above-groundwater
