Questions 17~20 are based on the following passage. You now have 20 seconds to read Questions 17~20.
Farmers usually use plows to prepare their fields for planting crops. Plows cut into the ground, and lift up weeds, and other unwanted plants. However, plowing is blamed for causing severe damage to top soil by removing the plants that protect soil from being blown or washed away. Many farmers in South Asia are now trying a process called Low Till Farming. Low Till Farming limits the use of plows. In this method of farming, seeds and fertilizer are put into the soil through small cuts made in the surface of the ground. Low Till Agriculture leaves much or all the soil and remains of plants on the ground. They serve as a natural fertilizer and help support the roots of future crops. They take in rain and allow it to flow into the soil instead of running off. It has been proved that Low Till Farming increases harvests and reduces water use, and this method reduces the need fo
A. The crop’s blooming period is delayed.
B. The roots of crops are cut off.
C. The topsoil is seriously damaged.
D. The growth of weeds is accelerated.
It might be supposed that greater
efficiency could be achieved if several people worked together to solve a
problem than if only one individual works on it. Although groups often may increase the motivation of their members to deal with problems, there are conflicts arising among members of a group. Problem solving needs the presence of an effective leader who not only provides direction, but also permits the orderly, constructive expression of different opinions; much of the leader’s effort may be devoted to resolving differences. Success in problem solving also depends on the distribution of ability within a group. Although groups may reach a greater number of correct solutions, or may require less time to discover an answer, their efficiency is typically lower than that achieved by A. the presence of an effective leader B. the best way to collect resources C. everyone to work harder D. more funds [单项选择]Questions 21-25 are based on the following passage:
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