一、单项填空
1．Cigarettes and alcohol do such______great harm to health that th ey can easily cause______weakening of our bodies.
A．a；/ B．/；the
C．a；the D．/；/
解析：考查冠词的用法。句意：烟和酒对健康的危害是那么的大以至于它们很容易使我们的体质衰退。do harm to是固定搭配不用冠词表示“危害……”；weakening后有定语of our bodies，故表示特指，因此用定冠词the。
答案：B
2．The international agreement，______encourage children not to smoke and help pe
