下列各组物质中化学键的类型完全相同的是（   ）

根据对话内容，从方框中选择恰当的选项补全对话，其中有两项多余。A：Hello, Sean．
B：Hi, Peter． ____
A：No, I don't． ____
B：She's Tracy．She is my sister's friend．
A： ____
B：Yes, my sister always tells me her things (事情)．I even(甚至)know her eating habits．
A：Really? ____
B：She likes milk and eggs for breakfast．She likes vegetables for lunch and fruit for dinner．
A：I think she eats well．
B：Yes, and she always plays tennis. We must learn from(向……学习) her. ____
A：OK. Let's meet at 5：00．

A．Who is she? B．What are they? C．Do you know her? D．Is the girl your sister's friend? E．The girl's eating habits are very good． F．What about playing tennis after school? G．Do you know the girl in green in Class Four?

如图四幅著名的景观图中，位于欧洲的是（    ）

“借用别人的智慧来做事，因为你的智慧是有限的。”这句话所强调的是
①做事要充分发挥主观能动性     
②做事要考虑事物的联系，割断那些不利的联系
③ 任何事物都是矛盾统一体，人不可能没有缺憾   
④任何理性认识都是正确有用的，要借用别人的认识

求角的度数．（如图）∠1=30°，∠2=____度，∠3=____度．