某体委组织篮球友谊赛，共有32个队参加，采用淘汰制比赛，第一轮要赛____场，若第二轮改为单循环，那么第二轮比赛一共赛____场可以决出冠军。

一半径为R的半圆柱形玻璃砖，横截面如图所示．已知玻璃的全反射临界角为γ（γ＜ $\frac{\pi }{3}$ ）．与玻璃砖的底平面成（ $\frac{\pi }{2}$ ﹣γ）角度、且与玻璃砖横截面平行的平行光射到玻璃砖的半圆柱面上．经柱面折射后，有部分光（包括与柱面相切的入射光）能直接从玻璃砖底面射出，若忽略经半圆柱内表面反射后射出的光，求底面透光部分的宽度．

亚洲和欧洲的分界线是（  ）

    Do you want to do well in exams? Sometimes your knowledge is not enough， you also need good strategies．Here are some for you:

    Before you answer the questions，if you feel a little nervous， take a few deep breaths to help you relax．

    Always read the question carefully and make sure that you understand it．Read it a few times if possible．

    Find out how much each question is worth or how many points you need．

    If it asks to give one answer， only write one．

    If there's a difficult question， don't worry．Go on to the next question and come back to it if you have time later．

    Try not to leave questions unanswered when you finish the test．Sometimes a guess may get you points．

    When you finish, go back and check your answers．You will need to check your writing for spelling mistakes．

下列有关《西游记》的表述正确的一项是（    ）