人教高中英语复习课堂练习30 ：选择性必修2 Unit 6　Survival Word版含解析.doc

课时质量评价(三十)
选择性必修第二册　Unit 6　Survival
A组·基础巩固
Ⅰ. 语法填空
A
The polar bear is found in the Arctic Circle and some big land masses as far south as Newfoundland. While they are rare north of 88°， there is evidence 1. ________ they range all the way across the Arctic, and as far south as James Bay in Canada. It is difficult to figure out a global population of polar bears as much of the range has been 2. ________ (poor) studied; however, biologists calculate that there are about 20，000－25，000 polar bears worldwide.
Modern methods 3. ________ tracking polar bear populations have been employed only since the mid­1980s, and are expensive 4. ________ (perform) consistently over a large area. In recent years some Inuit people in Nunavut 5. ________ (report) increases in bear sightings around human settlements, leading to a 6. ________ (believe) that populations are increasing. Scientists have responded by 7. ________ (note) that hungry bears may be congregating (聚集) around human settlements, leading to the illusion (错觉) that populations are 8. ________ (high) than they actually are. Of 9. ________ nineteen recognized polar bear subpopulations, three are declining, six 10. ________ (be) stable, one is increasing, and nine lack enough data.
【语篇解读】本文是一篇说明文。文章介绍了由于生存环境恶化，北极熊数量减少的状况。
1. that　考查名词性从句。本句含有一个同位语从句，解释了名词evidence“证据”的具体内容，空处在从句中不充当成分，也无意义，故填that。
2. poorly　考查副词。应用副词poorly修饰动词