A、300 B、100 C、71 D、64 A本题属于数字听力题。选项中的四个数字均出现于材料中，要记准每个数字代表的含义。其中，“300”表示未来20年要卖给中国的飞机数量，100出现在“the 100-seater planes”中表示100个座位的飞

The first homegrown Chinese jetliner, the medium range ARJ-21 Advanced Regional Jet for the 21st Century, should start to roll off the production line later this year. China expects to sell 300 of the 100-seater planes to Chinese customers over the next 20 years. There are 71 firm orders from smaller domestic carriers, and China intends to target export markets in Asia, Africa and South America.China is the world’s second largest market for planes outside the US. Sales are booming as the country’s airlines race to meet the surged demand for domestic air travel. According to a leading London consultancy, Boeing currently leads the way in China with a 64% market share. But Airbus is closing the gap. Both companies have invested heavily there, manufacturing parts in the country transferring technical know-how.