________ climb the tree. It is dangerous.
A. Doesn’t
B. Not
C. Don’t
D. Isn’t
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________ me your driving license, please.
A. Show
B. To show
C. Showing
D. Showed
We are at the library . Please ________ quiet .
A. do
B. be
C. can
D. are
基于物理学中,三角形具有稳定性这一原理,衍生出攀岩的()平衡。
基础平衡分为“两手一脚”及“一手两脚”这两种()
A. 对
B. 错