下列关于打电话的说法中正确的是（　　）

阅读下面短文，根据句意或提示，在空格处填入一个适当的词，每空一词。

    Do you know Jay Chou? If you like watching "the Voice of China" this ____ /'sΛmә/, you must know him. Jay is a very popular singer in China. Jay is his ____ name and Chou is his last name. He is thirty-seven ____ old. His was *born on January 18th. He is f____ Taiwan. His favourite sport is ____, so he plays basketball every day. And his favourite ____ is blue. He can sing ____ write songs very well. Many people like ____ (listen) to his music. He is also a good teacher at the Voice of China on Zhejiang TV, because he helps his s____ a lot. Chen Zitong and Leon Lee ____ (be) two good students in his team.

（美国杜邦公司）“1802年，从法国购进机器，在特拉华州的威尔明顿市郊创建了火药厂，生产黑色火药。不久，法国订单便源源不断到来。”法国大量订购火药的主要原因是（   ）

我国西北地区发展农业的主要限制性因素是（）