听懂澳大利亚的客人讲话对我来讲很容易。故选B。
[2017浙江温州]3. Leo was so _____ that he rushed to the kitchen, hoping to find something to eat.
A. thirsty B. hungry C. tired D. sleepy
B[解析]考查形容词词义辨析。句意为：Leo如此饿，以致他冲进厨房，希望找到吃的东西。thirsty渴的；hungry饥饿的；tired疲劳的；sleepy疲倦的。根据句意可知答案为B.
(2017云南昆明)33. —It?s smoggy these days. That?s terrible! —Yes. I hope to plant trees. ______ trees, ______ air pollution. A. The more, the fewer B. The less, the more C. The less, the fewer D. The more, the less
D【解析】本题考查形容词的比较等级的用法。题干意为：这些天是雾霾天气。太可怕了！是的。我希望种树。_____树，_____空气污染。more 后接可数名词复数形式或者不可数名词；less后接不可数名词；fewer后接可数名词复数形式。trees为可数名词复数形式，排除B、C；pollution为不可数名词，故用less，故选D。
(2017云南昆明)30. The safety of food has become one of the _______ problems in our daily life.
A. more expensive B. more important C. most expensive D. most important
D【解析】本题考查形容词的比较等级和词义的辨析。题干意为：食物安全已经成为我们日常生活中_____的问题之一。more expensive更加昂贵的，比较级；more important更加重要的，比较级； most expensive最昂贵的，最高级；most important最重要的，最高级。one of后接形容词的组高级，结合句意，可知食品安全已经成为最重要的问题之一，故选D。
【2017四川泸州】6. Linda is one of ______ students in our class. A. good B. better C. best D. the best D。【解析】考查形容词最高级的用法。句意为：琳达是我们班最好的学生之一。one of + the+最高级+复数名词，意思是：…中最…的一个，所以选择D。