第21题: [单项选择]At present, China has signed many ______ trade agreements with other countries. A. comprehensive B. reciprocal C. favourable D. advantageous 参考答案:B 答案解析:reciprocal互惠的;comprehensive综合的;favourable赞同的,适宜的;advantageous有利的,有益的。句意:目前,中国已同很多国家签署了贸易协定。