管材表面超声波探伤的计量单位是（）。

听力原文：W: Hello. Officer Jones speaking.M: Well, I'd like...

单项选择题听力原文：W: Hello. Officer Jones speaking.
M: Well, I'd like to report a UFO sighting.
W: A what? M: A UFO! When I was driving hone from a party three hours ago at 6:30, I saw this bright light overhead. It disappeared behind a hill, so 1 started driving toward where the UFO landed.
W: Now, how do you know it was a UFO? Perhaps you only saw the lights of an airplane.
M: Well if it was that, how do you explain 'the BEAST'?
W: What do you mean, 'the BEAST'?
M: Okay. I kept driving for about five minutes when suddenly, this giant, hairy creature jumped out in front of my car.
W: Then what? M: Well, then, the beast picked up the front of my car and said, 'Get out of the car. I'm taking yon to my master!' Something like that.
W: Wow? A hairy beast who can speak English?
M: I'm not making this up. Then, the beast opened the car door, carried me on his shoulders to the UFO, and fiat's when I woke up alongside the road. The beast must lave knocked me out and left me there.
W: Well, that's the best story I've heard all night, sir. Have you been taking any drugs or alcohol in the last 24 hours? You mentioned you went to a party.
M: What? Well, I did have a few beers, but I’m telling the troth.
W: Okay, okay. We have a great doctor that deals with THESE kinds of cases. Thank you for your story.
(20)
A．6:30 P.M.
B．3:30 P.M.
C．9:30 P.M.
D．7:00 P.M.

A．The man needs to sec a doctor for some counseling.B．T...

单项选择题A．The man needs to sec a doctor for some counseling.
B．The man has been frightened by the UFO.
C．The man shouldn't go to the party.
D．The man has been hurt by the beast and needs to see a doctor.

听力原文： April Fool's Day started in the sixteenth century...

单项选择题听力原文： April Fool's Day started in the sixteenth century in Europe. Before that time, New Year's Day was celebrated on April 1st. Then a new calendar was introduced called the Gregorian calendar. January 1st became the first day of the year, but many people did not know about it. So those who continued to celebrate New Year's Day on April 1st were laughed at. They were called fools.
Nowadays we play jokes on people on April 1st. For example, someone might put salt in the sugar container so another person could 'accidentally' put it in their coffee. Or someone might change the time on another person's alarm clock so that person would unknowingly wake up earlier or later than planned. Or maybe a person would tell a lie to make someone else shocked. After we play the trick, we say 'April Fool.' Then the poor person realizes he was fooled. In many countries newspapers and the other media participate with false headlines or news stories. It is generally done in the spirit of fun and doesn't cause any real harm to anyone. Do you have any great jokes to play on others? Try it out an April 1st. Just don't forget to say 'April Fool' when the other person begins looking a little confused.
(23)
A．Play jokes on others.
B．Say 'April Fool' to others.
C．Celebrate the New Year.
D．Celebrate the adoption of calendar.