单项选择题
A.ups and downs B.from head to toe C.time and again D.over and over
The local government tried its best to ensure each of ...
单项选择题The local government tried its best to ensure each of its citizens a（）supply of food at regular intervals (时间间隔).
A.consistent B.continual C.continuous D.numerous
The United Nations Conference on Global Environment, w...
单项选择题The United Nations Conference on Global Environment, which took place earlier this year in Vienna, was a very（） meeting.
A.productive B.communicative C.aggressive D.protective
We watched the plane（）behind the clouds.A.disappearingB...
单项选择题We watched the plane（）behind the clouds.
A.disappearing B.disappeared C.diving D.dived
