听力原文：How about farmers' income in the late 1970s？
(34)
A. Farmers had less money to spend than other Americans.
B. Farmers earned about one-third the income of non-farmers.
C. Farmers earned almost as much money as the non-farmers.
D. Farmers earned more money than the average American families.
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Many food-carrying bags, made from high density polyethylene, are extremely difficult to recycle.
A. Y
B. N
C. NG
A．A druggist's suggestion.B．An article.C．An advertisement.D．A sales clerk's comment.
A druggist's suggestion.
B. An article.
C. An advertisement.
D. A sales clerk's comment.
听力原文：Why can't the average farm family income explain the situation for all farmers？
(35)
A. Because it is higher than the income of the average American family.
Because farmers have little money left after paying all necessary expenses.
C. Because the situation in small farms and large farms is quite different.
D. Because 2004 is the best year for farm families.
设=cos4x，则dy=
A. 4sin4xdx
B. -4sin4xdx
C. (1/4)sin4xdx
D. -(1/4)sin4xdx
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