Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word for each of the blanks.
Wind, water, air, ice and heat all work to cause erosion. As the wind blows over the land, it often______ (51) small grains of sand. When these grains of sand strike against solid rocks, the rocks are slowly worn away. In this way, _____(52) very hard rocks are worn away by the wind.
When particles of rocks or soil became loosened in any way, running water carries them down the_____ (53) . Some rocks and soil particles are carried into streams and then into the sea.
Land that is covered with trees. grass and other plants wears away very slowly, and so loses very ______(54) of its soil. The roots of plants help to_____ (55) the rocks and soil in place. Water that falls on grasslands runs away more slowly than water that falls on bare ground. Thus, forests and grasslands ______(56) to slow down erosion.
Even where the land is______ (57) covered with plants, some erosion goes on. ln the spring, the______ (58) snow turns into a large quantity of water that then runs downhill in streams. _______(59) a stream carries away some of the soil, the stream bed gets deeper and deeper. _____(60) thousands of years of such erosion. wide valleys are often formed.
Trả lời câu hỏi dưới đây:
______(60)
A Đáp án đúng: “After thousands of years of such erosion, wide valleys are often formed. "( Sau hàng nghìn năm của sự xói mòn, những thung lũng rộng thường được hình thành)
B Phương án sai: “during” = trong suốt
C Phương án sai: “among” dùng để chỉ một nhóm, một tập hợp nào đó.
D Phương án sai: “in” giới từ chỉ thời điểm trong tương lai