----- Nội dung dịch tự động từ ảnh -----
Read and complete.
Rivers are one of the world's most important natural resources. Many cities are on large
rivers, and (49) every country has at least one river that plays an important part in the lives of
its people.
Besides transportation, rivers (50)
opportunities for recreation for people who live along their banks. And in order to get water for
crops, engineers sometimes build a dam (51)_a river and let the water become a lake behind
the dam. Then people can use their water not only to irrigate fields but also to make electricity
for homes and industries.
_food, water for crops, water to drink, and
However, the water often becomes (52) _ when cities on river banks grow in size and the
number of industries increases. We are learning that it is necessary to keep rivers clean if we
want to enjoy the (53)_of the natural resources.
40. A. many
50. A. provide
C. plenty of
C. assist
C. among
C. polluted
C. tips
B. a lot
D. almost
B. support
D. create
51. A. over
B. across
D. under
52. A. crowded
B. overloaded
D. excited
53. A. interests
B. benefits
D. receipts