根据中文提示写出单词或词组，使句意完整、正确。

小题1:Great changes have taken place in China in ______（最近的）years.

小题2:—How many boys are there in your class?

—Thirty, about sixty_____(百分之)of the students in our class.

小题3: —The water in the river is dirty.

—Government has passed_____ (法律) against water pollution.

小题4:He joined the______(军队) in 2000.

小题5:“The greenhouse effect”causes the level of the oceans to_____ (上升).

持续过度膨肺可造成（）

A.低氧血症及高血压

B.高碳酸血症及低血压

C.低二氧化碳血症及低血压

D.碱中毒及心动过缓

E.氧中毒及心动过速