M: Yes. That program I watched last night will be shown again this afternoon。
W: Really? I will make sure not to miss it! Bye for now!
M: See you later!
Questions 23 to 25 are based on the conversation you have just heard。
23. Why didnt the man show up yesterday evening?
24. Who is Natalie?
25. Which of the following statements is NOT true according to the conversation?
Section B
Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A), B), C) and D). Then mark the corresponding letter on Answer Sheet 2 with a single line through the centre。
Passage One
What makes it rain? Rain falls from clouds for the same reason anything falls to Earth. The Earths gravity pulls it. But every cloud is made of water droplets or ice crystals. Why doesnt rain or snow fall constantly from all clouds? The droplets of ice crystals in clouds are very small. The effect of gravity on them is minute. Air currents move and lift droplets so that net downward displacement is zero, even though the droplets are in constant motion。
Droplets and ice crystals behave somewhat like dust in the air made visible in a shaft of sunlight. To the casual observer, dust seems to act in a totally random fashion without fixed direction. But in fact dust particles are much larger than water droplets and they finally fall. The cloud droplet of average size is only 1/2500 inch in diameter. It is so small that it would take sixteen hours to fall a mile in perfectly still air, and it does not fall out of moving air at all. Only when the droplet grows to a diameter of 1/125 inch or larger can it fall from the clouds. The average raindrop contains a million times as much water as a tiny cloud droplet. The growth of a cloud droplet to a size large enough to fall out is the cause of rain and other forms of precipitation. This important growth process is called coalescence。
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