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"Greenhouse gases" in Par

A．2 refer to ________________.A. oxygenB. hydrogenC. carbon dioxideD. air
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By citing the Sept. 11 case, the author purports to suggest that the planned DHS is _________.
A．not well-organized
B．not inclusive enough
C．too costly
D．too huge
单项选择题
An appropriate title for this passage might be ____________.
A．The Functions of Keeping a Diary
B．Why I Keep a Diary
C．Calming Down
D．How to Keep a Diary
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