一只雌鼠的一条染色体上某基因发生了突变，使野生型性状变为突变型性状。该雌鼠与野生型雄鼠杂交，F₁的雌、雄中均既有野生型，又有突变型。若要通过一次杂交实验鉴别突变基因在X染色体还是在常染色体上，在F₁中选择杂交的个体最好是（）

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” mean “old long since”. No one knows who wrote the poem first. However, a version (版本) by Scottish poet Robert Burns was published（出版）in 1796. The words and the 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 our radio friends a very Happy New Year! This is Buddy Thomas.
【小题1】This passage is from ___________.

【小题2】Who is introducing Auld Lang Syne to us ?

【小题3】The words and the music of Auld Lang Syne we know today first appeared _________.

“冷战”时期的批评家曾指责一些军事联盟如北约和华约推动了高昂的军备竞赛，并使地区冲突一直有转变为超级大国之间核对抗的危险。这反映了在“冷战”时期(　　)

—Yes. The food safety is a serious       .