units 15~16 the necklace scientists at work
ⅰ.单项填空
1.i can never forget one afternoon ten years ago________you came to my house and helped me out of trouble.
a.while b.when c.that d.where
答案:b
2.more natural resources should be________use of to meet the increasing need of energy.
a.put b.brought c.taken d.made
解析:此是make use of短语的被动语态形式。
答案:d
3.i told you that you shouldn’t waste your time playing football all day long,________?
a.didn’t i b.did i c.should you d.shouldn’t you
解析:反意疑问句通常要与主句的主语和谓语一致。此句意为“我没告诉过你吗?”
答案:a
4.this material________,so be careful when you wear it.
a.is torn easily b.is torn easy c.tears easily d.tears easy
解析:tear“破裂,撕破”,可用作不及物动词,后跟一副词,表示某东西的特性。
答案:c
5.________existed a certain doubt among the