题目

根据句子意思和所给首字母或中文提示，在标有题号的横线上写出一个英语单词的完整、正确形式，使句意通顺。 81. Calculate what p______ of your income you spend on food. 82. Even slight rent increases would cause considerable h_____. 83. As the wages were low, there were few a______ for the post. 84. Scientists are hoping for a b_____ in the search for a cure for cancer. 85. Your ticket is v_____ for travel at anytime of the day. 86. Radio is an important communication _______(媒介) in many countries. 87. Team members will be selected according to s下列关于企业之间的商贸联系的说法，正确的是 A. 目前在区际之间的贸易往来主要是工业产品 B. 商贸联系仅发生在国家和国家、洲和洲之间  C. 如果某区域生产某产品并且形成了专业生产区域，则这种产品供应区外的剩余产品就越多 D. 伴随产业活动地域分工的不断加深，工业企业之间的商贸联系将会越来越少，因为有的企业完全能够生产全部产品