石块放入前水的体积是____ cm³，那么石块的体积是____cm³．

一项对中小学生的抽样调查显示：目前，中小学生的心理承受能力较弱，有的学生因为学习上遭遇一些挫折，就自暴自弃，学习成绩一落千丈；个别学生还因此逃学，甚至走上违法犯罪的道路。对此下列说法中正确的是（    ）

①学校要开设挫折教育课程                      ②家长应该有意识地让孩子经受一些挫折考验 

③中小学生承受挫折的能力都不强          ④学生应该加强自我锻炼，提高承受挫折的能力

生物体遗传信息的中心是（　　）

阅读下面的短文，根据短文内容完成句子。每空词数不限。

    This is a song millions of Americans will hear this New Year's Eve. It is called “Auld Lang Syne(《友谊地久天长》)”. It is the traditional music played during the New Year's celebration. Auld Lang Syne is an old Scottish poem. It tells about the need to remember old friends.

    The words “auld lang syne” means “old long since”. No one knows who wrote the poem first. However, a version (译本) by Scottish poet Robert Burns was published in 1796. The words and music we know today first appeared in a songbook three years later.

    The song is played in the United States mainly on New Year's Eve. The version you are hearing today is by the Washington Saxophone Quartet. As we end our program with “Auld Lang Syne”, I would like to wish all of our radio friends a very Happy New Year! This is Buddy Thomas.