单项选择题

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A.She thinks the man should have helped earlier.
B.She doesn’’t need the man’’s help.
C.She doesn’’t know the boxes are heavy.
D.She wants the man to help with the boxes.
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单项选择题
By saying nobody undersells America ( Line 4, Para. 3 ), the author means that _________.
A.no other country underestimates the competitiveness of American products
B.nobody expects the Americans to cut the prices of their commodities
C.nobody restrains the selling of American goods
D.no other country sells at a lower price than America
单项选择题
Among humanity’’s current problems ( Para. 3), the chief concern of the scientists is ________.
A.the impoverishment of developing countries
B.the explosion of the human population
C.the reduction of biological diversity
D.the effect of global warming
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