Conversation Two
W: Dr. Thomas? This is Keet Bradley from the Daily News. [22]I'd like to ask you some questions about the new official standard weight that you purchased.
M: I'd be happy to help you. What would you like to know?
W: First of all, how was the standard weight used?
M: Well, [23]people in our department use it to check the scales all over the country. The department of weights and measures, we are a government agency. It's our responsibility [23]to see that all the scales measure a kilogram accurately so this is the way we use to adjust the scales.
W: How did you check the scales before?
M: We have an old standard weight that we used to use. It had to be replaced because it was imprecise. [24]You see it was made of poor quality metal that absorbed too much moisture.
W: Oh. So when the weather was humid it weighed more and when it was dry it weighed less.
M: Exactly. And that variation can affect the standards of the whole country. So our department had the new weight made out of higher quality metal.
W: How much did it cost?
M: About 45,000 dollars.
W: 45,000 dollars? For a one kilogram weight? That's more expensive than gold. Is it really worth that much?
M: [25]I'm sure it is. Industries depend on our government agency to monitor the accuracy of scales so that when they buy and sell their products there is one standard. Think of the drug industry, for example, those companies rely on high accuracy scales to manufacture and package medicine.

Questions 22 to 25 are based on the conversation you have just heard.
22. What is the conversation mainly about?
正確答案：B
解析：女士說：“我想問您一些關于您買的官方標準砝碼的問題。”直接進入話題，故B正確。所有選項都是類似于名詞詞組的表達，可以判斷出題目是主旨題。
23. How is the new weight used?
正確答案：A
解析：男士說：“我們部門的人用它來檢查全國的（重量）計量器……確保所有的（重量）計量器都能準確地測量一公斤……”。故答案為A。四個選項都是動詞不定式結構，多表示目的（用途）、打算或將來的動作。根據選項內容可以判斷題目詢問某物的用途。對話中還有提示，在聽到問題“how was the standard weight used”時，要注意問題的回答。
24. Why is it necessary to replace the old standard weight?
正確答案：C
解析：男士說：“你知道它是由容易滲水的劣質金屬制成的。”故答案為C。前面三個選項都有it，描述的都是it無法再使用的原因，故可基本推斷出問題。注意“聽到什么選什么”。
25. What does the man probably think about the cost of the new weight?
正確答案：D
解析：男士說：“我肯定（物有所值）。所有產業都依靠我們政府機構來監控他們的（重量）計量器，從而當他們買賣產品時能有一個（重量）標準。”故D正確。根據選項的提示詞small, value, reasonable和high，可猜測題目是問對某物價值的評價。“I'm sure it is”是省略句，省略worth it，說明男士認為這個價錢物有所值。