单项选择题

The word "Also" (line 2, para. 2) is used to （）

A．continue the discussion of total U.S. electricity use
B．expand the topic of reduction of energy and water use
C．include the discussion of public transportation
D．shift the focus to the topic of the environment protection

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单项选择题

What does green building refer to nowadays（）

A．Buildings painted by green hands.
B．Buildings covered with green plants.
C．Buildings that are environmentally-friendly.
D．Buildings like houses, factories, and offices.

单项选择题

Becoming aware of our mother's age, not just in numbers of years but （）her psychological and physical state, often helps us to understand her better.

A．in spite of
B．on account of
C．in terms of
D．by means of