单项选择题

笑气属于（）

A．第一代毒品
B．第二代毒品
C．化学品
D．第三代毒品

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Which is not right about the writing steps? ( ） A. You begin with a good thesis statement that is not too narrow or broad B. You write good paragraph that are well supported with specific and adequate evidence. C. You organize and connect the specific evidence in a logic way. D. You must write long and complex sentences so that your essay sounds academic.

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1011000011000011的HDB3编码为（）。
A、1011000011000011
B、：+10-1+1000+1-1+1-100-1+1-1
C、+10-1+1000-1+1-1000+1-1+1
D、+10-1+1000+1-1+1-100+1-1+1