有一只青蛙在井底，每天上爬10米，又下滑6米，这13井深20米，这只青蛙爬出井口至少需要多少天？（）
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先张法施工中，预应力筋数量较多时，可从一端逐根向另一端放张。( )
建筑涂料的选择应考虑建筑装饰效果、耐久性和______的原则。
43 What did the team find out about honey badgers？
A. There were some creatures they did not eat.
B. They were afraid of poisonous creatures.
C. Female badgers did not mix with male badgers.
D. They may get some of the water they needed from fruit.
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