单项选择题

The researchers concluded that ______.

A．the public are not interested in art on public transport
B．art on public transport should be carefully situated
C．art on public transport should be very simple
D．paintings are not suitable for public transport

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单项选择题

What does the word contaminated (Sentence 9, Para.2) mean

A．Cleaned.
B．Polluted.
C．Widened.
D．Expanded.

单项选择题

According to Laura, the word 'organic' describes ______.

A．a way of farming that is completely free of chemicals
B．a kind of food from which all chemicals have been removed
C．a way of growing things without using artificial chemicals
D．a kind of food that contains natural but not artificial chemicals