身临其境：请你各写出一种正确做法及相应的简要理由。

情境一：你发现同桌的同学考试作弊。

正确做法：                                                                                                                                           

理由：                                                                                                                                                  

情境二：放学途中，你的同学约你去网吧。

正确做法：                                                                                                                                            

理由：                                                                                                                                                  

情境三：你同班的一位同学中途辍学。

正确做法：                                                                                                                                           

理由：                                                                                                                                                  

为感染性休克病人迅速纠正血容量不足时，下列各组液体中，首选的是（）。

A.以平衡盐溶液为主，配合适量血浆和全血

B.以胶体溶液为主

C.等张生理盐水加代血浆

D.葡萄糖溶液加代血浆

E.全血配合葡萄糖