单项选择题

A．Some birds do not build nests at all.
B．All nests are sewed with grasses.
C．Most of nests are made of mud.
D．The tailor bird uses a needle to sew its nest.
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单项选择题
... Old is suddenly in (Line 1, Para. 1 ) most probably means “ ________”.
A．America has suddenly become a nation of old people
B．gerontology has suddenly become popular
C．more elderly professors are found on American campuses
D．American colleges have realized the need of enrolling older students
单项选择题
As indicated in this passage, with so many good claims, the consumers ________.
A．are becoming more cautious about the products they are going to buy
B．are still not willing to pay more for products with green labeling
C．are becoming more aware of the effects different products have on the environment
D．still do not know the exact impact of different products on the environment
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