单项选择题

It can be concluded that the tone of the passage is ______.

A． complimentary
B． encouraging
C． critical
D． pessimistic
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单项选择题
Which of the following about the green tag is NOT true
A． It was designed to compensate for the emissions a car exits into theair.
B． TerraPass gathers its members' fees and invests them in clean energy production.
C． Many companies purchased green tags for various purposes
D． Consumers can benefit high return from green tag.
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