单项选择题

In the 2nd paragraph ’roads’means（）.

A.some roads
B.high ways
C.country roads
D.heavy roads

<上一题目录下一题>

热门试题

单项选择题

’This practice’in Paragraph 4refers to（）.

A.that farmers have lowered the yield of corn and soybean
B.that farmers have expanded croplands
C.that farmers have applied more chemical fertilizers
D.that the top soil has been decreased greatly

单项选择题

At the present rate，approximately how many years later the black top soil now covering the Midwest will completely be blown or washed away？（）

A.120 years later.
B.80 years later.
C.50 years later.
D.100 years later.