作业：词汇选择（十五选十）

Directions:In this section, there is a passage with ten blanks. You are required to select one word for each blank from a list of choices given in a word bank following the passage. Read the passage through carefully before making your choices. Each choice in the bank is identified by a letter. You may not use any of the words in the bank more than once.

 

Humans use water for three basic purposes: agriculture, industry, and domestic and municipal use (water for drinking, cooking, cleaning, and so forth). And the amount of water   1   to each person decreases as the population grows,   2   the possibility of water shortages. Water shortages will not come all at once in every part of the world, just as the world's population is   3   distributed by region, so is the annual supply of   4   water. Rainfall and snowfall are determined by uneven weather patterns and landscape, and as a   5  , some areas of the world get more precipitation (降水) than others. This leads the uneven distribution of water all over the world.

Natural water scarcity has   6   many nations to try to increase their water supplies by building dams to catch water that otherwise would escape to the sea, or by sinking more and deeper wells. But these efforts can have   7   side effects that can contribute to water scarcity. Instead of building dams, some countries choose to increase their access to groundwater. But this practice increases the   8   of over pumping aquifers (蓄水层).

Pollution also affects the water supply, reducing the available water by making it toxic or otherwise unfit for human use.

Water shortages could also lead to   9   conflicts as countries compete for limited water resources. Political tensions over water often appear when different nations lay claim to the same river, lake, or aquifer. According to the UN, more than 300 river basins and aquifers worldwide cross-national boundaries are creating the   10   for conflicts.

    A. arousing

    B. available

    C. densely

    D. international

    E. limited

    F. national

    G. negative

    H. potential

    I. prompted

    J. raising

    K. renewable

    L. result

    M. risk

    N. rule

    O. unevenly