Water is one of the most abundant substances on the earth’s surface. A casual glance at a world map might makeyou think that the earth has enough water to    26    the needs of living things forever. But this is not the case at all:fresh water only   27   about 3 percent of the earth’s water. On top of that, most of this fresh water cannot be usedbecause it is   28   in ice, mainly in icecaps near the North and South Poles and in glaciers. In fact, only 15 percentof the earth’s fresh water is available for use by living things. This very small percent represents the earth’s totalavailable supply of fresh water. With such a limited supply, you might wonder why the earth does not   29   freshwater. It does not because the supply of fresh water is continuously being renewed.
【題組】26
(A) get
(B) take
(C) meet
(D) have