压轴的两道题..... 

还真的防不胜防...

Got teach b4 meh....?

Or I totally missed it?

How to prepare for these kind of questions xia? 

Or simply no need to prepare, 会就会，不会就不会, cuz 这些问题的存在，就是要区分tip top students from the norms?? 

会, 是tip top. 不会，是正常？

Mmmmmmmmm.

耐人寻味.