单项选择题

A．The disadvantages of working in an office.
B．The waste produced in an office.
C．To save resources when working in an office.
D．How to save water in a restroom.
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单项选择题
A．Because it changes color in a regular 24-hour rhythm.B．Because it changes color in response to the sun’’s rays.C．Because it constantly changes color.D．Because it changes color every hour.
A．Because it changes color in a regular 24-hour rhythm.
B．Because it changes color in response to the sun’’s rays.
C．Because it constantly changes color.
D．Because it changes color every hour.
单项选择题
A．Visiting her professor.B．Having dinner with the man.C．Going shopping.D．Having no plan at that moment.
A．Visiting her professor.
B．Having dinner with the man.
C．Going shopping.
D．Having no plan at that moment.
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