待做某事"。]

8．is called　[考查时态和语态。这种现象被称为食物沙漠。本文的基本时态为一般现在时，故用一般现在时；又This phenomenon与call之间是被动关系，故使用被动语态。]

9．when　[考查关系词。a decade为先行词，表示时间，后面是定语从句，句中缺少时间状语，故填when。]

10．choice(s)　[考查名词。食物选择的不均衡性并不局限在世界某个区域。空前有名词作定语，空处作介词of的宾语，故空处应用名词形式。choice"选择"既可作可数名词，又可作不可数名词，故填choice(s)。]

（二）

What is the bad news？Thousands of years ago，the earth had around six trillion trees.Human activity has cut the number of trees on the planet 6.________ half.A good example of this is 7.________ fact that Europe used to be one of the giant forests.Dr Crowther said people are 8.________ (responsibility) for the loss of three trillion trees.Another 15 billion trees are lost each year because of deforestation (毁林) and farmland.The scientists said this figure is"9.________ (extreme) higher" than a century ago.Dr Crowther added，"This study highlights how much more effort 10.________ (need) if we are to restore healthy forests worldwide."

【语篇解读】　这是一篇说明文。文中介绍了地球上树木的现有量。

1．that　[考查名词性从句。分析句子结构可知，空处引导表语从句，从句成分和句意完整，故用that。]

2．thought　[考查时态。这里说的是"比我们原本以为的......"，故要用一般过去时。]

3．calculation　[考查名词。根据空前的"a"可知此处要用名词形式。]

4．followed　[考查非谓语动词。follow与three之间有逻辑上的动宾关系，所以用过去分词作定语。]

5．to change　[考查非谓语动词。be (un)able to do sth.意为"(不)能做某事"