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Our future house will be on the ocean. It ll be surrounded by tall trees and blue sea. But we only have salt water in the ocean. We need fresh water for drinking and for growing food on the farms.

Ocean water is too salty to drink. It is also too salty for watering plants. We must have the ways to make fresh water from water. We should be careful not to waste water.

Question

1.Where will your house be?

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2.What will it be surrounded?

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3.Is ocean water salty?

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4.What must, we have the ways to do?

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You are help me!!!

Mark the letter A, B, C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions          

must be treated.(A) Some underground water is (B) enough safe to drink, (C)  but all the surface water (D) must be treated.

A. Some 

B. enough safe

C. but 

D. must be treated.

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 35 to 42.

        Most desert animals will drink water if confronted with it, but many of them never have any opportunity. All living things must have water, or they will expire. The herbivores find it in desert plants. The carnivores slake their thirst with the flesh and blood of living prey. One of the most remarkable adjustments, however, has been made by the tiny kangaroo rat, who not only lives without drinking but subsists on a diet of dry seeds containing about 5% free water. Like other animals, he has the ability to manufacture water in his body by a metabolic conversion of carbohydrates. But he is notable for the parsimony with which he conserves his small supply by every possible means, expending only minuscule amounts in his excreta and through evaporation from his respiratory tract.

        Investigation into how the kangaroo rat can live without drinking water has involved various experiments with these small animals. Could kangaroo rats somehow store water in their bodies and slowly utilize these resources in the long periods when no free water is available from dew or rain? The simplest way to settle this question was to determine the total water content in the animals to see if it decreases as they are kept for long periods on a dry diet. If they slowly use up their water, the body should become increasingly dehydrated, and if they begin with a store of water, this should be evident from an initial high water content. Results of such experiments with kangaroo rats on dry diets for more than 7 weeks showed that the rats maintained their body weight. There was no trend toward a decrease in water content during the long period of water deprivation. When the kangaroo rats were given free access to water, they did not drink water. They did nibble on small pieces of watermelon, but this did not change appreciably the water itent in their bodies, which remained at 66.3 % to 67.2 % during this period.

         This is very close to the water content of dry-fed animals (66.5 %), and the availability of free water, therefore, did not lead to any “storage” that could be meaningful as a water reserve. This makes it reasonable to conclude that physiological storage of water is not a factor in the kangaroo rat’s ability to live on dry food.

What is the topic of this passage?

A. Kangaroo rats 

B. Water in the desert

C. Desert life

D. Physiological experiments