B卷

　　Ⅰ.阅读理解

　　A

　　(2016·江西省八所重点中学高三联考)Around the world，honeybee groups are dying in huge numbers: about one­third of nests collapse each year.For bees and the plants they pollinate (授粉)，as well as for beekeepers，farmers，honey lovers and everyone else who appreciates this marvelous social insect，this is a catastrophe.

　　Honeybee collapse has been particularly worrying because there is not one cause，but rather a thousand little cuts.The main elements include the mixed impact of pesticides (杀虫剂) applied to fields，as well as pesticides applied directly into nests to control bugs，pests and diseases; nutritional shortages caused by vast acreages of single­crop fields that lack diverse flowering plants; and commercial beekeeping itself，which destroys groups by moving most bees around the country multiple times each year to pollinate crops.

　　The real issue，though，is not the volume of problems，but the interactions among them.Here we find a major lesson from the bees that we ignore our risk：the concept of synergy(协同作用)，where one plus one equals three，or four，or more.A typical honeybee colony contains remains from more than 120 pesticides.Alone，each represents a benign dose (良性剂量)．But together they form a poisonous soup of chemicals whose interplay (相互作用) can greatly reduce the effectiveness of bees' immune systems，making them easier to suffer from diseases.

【2017版高考英语北师大版《名师伴你行》一轮复习课时作业：4《Cyberspace》（含解析）】相关文章：

★ 2014高考英语（新人教版）一轮基础训练（8）A、B卷（附答案或解析）

★ 【课堂新坐标】2017届高考英语（通用版）二轮复习书面表达专题训练：训练2 书信、邮件＋写人类记叙文（含解析）

★ 【北京专用】2014届高考英语一轮复习方案课时作业：选修8 Unit 5 Meeting your ancestors

★ 2014届高考英语一轮复习必修2参考答案（外研版）

★ 【北师大版】2014届高考英语一轮复习指导课时作业：Unit 6 B卷 Word版含解析

★ 【浙江专用】2014届高考英语一轮复习课时作业(三十三)选修7Unit 3《Under the sea》

★ 【三维设计】2017版（江苏专用）二轮复习练习：必修2 Unit 3《Amazing people》单元检测（含解析）

★ 2014届高考英语一轮复习课时作业(三十四)选修6Module 4《Music》（外研版）

★ 【课堂新坐标】2017届高考英语（通用版）二轮复习书面表达专题训练：Ⅱ卷强化增分练 训练2（含解析）

★ 2017届高考英语二轮复习大题冲关秘籍完形填空之记叙文：体验真题（含解析）