单项选择题

The word" nucleus" in the last sentence probably refers to ______.

A．musicians famous in Africa
B．musicians at the center of attention
C．musicians acting as the centre in a performance
D．active participation in a musical performance

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单项选择题

In the second paragraph, the underlined words the building most probably refer to ______.

A．an ordinary building
B．an energy-saving building
C．a green-colored building

单项选择题

When Holowka says in the last paragraph, It's going to be big , she means that green buildings ______.

A．will be more comfortable
B．will become popular in future
C．will be more environmentally friend