Question 21 is based on the passage you have just heard.

听力原文

        (19) [A pair of entrepreneurs are planning to build and launch a spacecraft that would carry and roast coffee beans in outer space.] The craft will use the heat of re-entry to roast coffee beans as they float inside it in a pressurised tank. The effect would be to roast the beans all over and produce perfect coffee. The businessmen say that (20) [on Earth, beans can easily break apart and get burned in the roaster.] But if gravity is removed, the beans float around in a heated oven, receive 360 degrees of evenly distributed heat and roast to near perfection. The spacecraft will reach a height of around 200 kilometers. The beans would then be roasted in the heat generated by the craft’s 20-minute re-entry into Earth’s atmosphere. Temperatures in the pressurised tank will be kept to around 200 ℃. Once back on Earth, the planet’s first space roasted beans would be used to make coffee that would be sold for the first time in Dubai. This is where the pair’s company is based. It is not clear how much they would charge for a cup. Surprisingly, the Space Roaster concept, should it go ahead, will not be the first attempt to take coffee into space. (21) [In 2015, two Italian companies collaborated on the construction of a similar type of spacecraft, which was the first coffee machine designed for use in space.] 

21. What did the two Italian companies do in 2015? （两家意大利公司在2015年做了什么？）

解析：C。录音结尾提到，2015年，两家意大利公司合作建造了一个相似类型的航天器，这是第一台为太空使用而设计的咖啡机。C项与此内容相符，其中的collaborated为原词复现，the first space coffee machine是对录音中the first coffee machine designed for use in space的同义替换，故C项为正确答案。

错项排除：录音后半部分提到，地球上第一批在太空烘烤的豆子将被制成咖啡，并在迪拜首次出售，每杯的售价尚不明确。A项与此内容不符，故错误。B项利用录音中的Dubai设置干扰，但根据录音内容，两家意大利公司与迪拜没有关联，且设在迪拜的是总部而不是分公司，故排除B项。D项中的abandoned在录音中无依据，故排除。