阅读理解。
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 by Scottish poet Robert Bums was published in 1796. The words and music we know today
first appeared in a song book 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.
1. This passage is from ______.
A. a newspaper
B. a magazine
C. a radio program
D. a book
2. ______ is introducing Auld Lang Syne to us.
A. Robert Bums
B. the Washington Saxophone Quartet.
C. Buddy Thomas
D. Scottish poet
3. From the passage, we know that the song Auld Lang Syne is mainly played in the USA ______.
A. on New Year’s Eve
B. on Christmas Eve
C. on weekends
D. on Thanksgiving Eve
4. The words and music of Auld Lang Syne we know today first appeared ______.
A. in 1796
B. in 1793
C. in 1799
D. in 1790
5. The song Auld Lang Syne is about ______.
A. the history of Scotland
B. an old Scottish poet
C. the need to remember old friends
D. Buddy Thomas
”形的光滑长直导轨槽，槽口向上（图为俯视图,图中两组平行双直线表示“
”形槽的两侧壁）．槽内放置一个滑块，滑块的左半部是半径为R的半圆柱形光滑凹槽，滑块的宽度为2R，恰与“
”形槽的两内侧壁的间距相等，滑块可在槽内沿槽壁自由滑动．现有一金属小球（可视为质点）以水平初速度v0沿槽的一侧壁冲向滑块，从滑块的半圆形槽口边缘进入滑块凹槽．已知金属小球的质量为m，滑块的质量为3m，整个运动过程中无机械能损失．求：
和
；
．
和
， （2分）
（2分）
；
（3分）
（3分）
（4分）
和
（2分）