题目内容
（请给出正确答案）
[单选题]
世界上最早使用的绿色标志是____标志。
A.日本生态标章
B.北欧白天鹅标章
C.德国蓝天使标志
D.中国环境标志
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第7题
If a glass of water is on a table with a piece of paper under it, it is relatively easy to pull the paper out without disturbing the glass very much if the pull is done very quickly. This is because,
A、the force on the glass will be less.
B、the momentum of the paper will be greater.
C、the time for the pull will be less.
D、the coefficient of kinetic friction will be less.
E、None of the others.
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