农业生产结构是指一个国家、一个地区或一个农业企业内农业生产各部门和部门内部的（）及其相互之间的比例关系。’
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It seems that Reader's Digest is a magazine popular with______.
A. people of all ages
B. teenagers
C. school teachers
D. elderly readers
我国山区面积约占全部国土面积的（）。
A. 40546
B. 40577
C. 40545
D. 40606
According to the author, well-chosen words can give people______.
A. hope, courage, and ideas
B. confidence, determination, and strength
C. pleasure, knowledge, and encouragement
D. entertainment, information, and power
The figures given in the third paragraph suggest that______.
Americans are dependent on cars
B. cars consume a lot of money
C. Americans need losing weight
D. excess of fat can be source of energy
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