—Excuse me, how long can I keep the book?
—You can return it by the end of this month.
A:give it away
B:come up with it
C:give it back
D:lend it again
Our house is on the top of the hill,and in winter the winds ______be pretty cold.
高空抛物现象被称为“悬在城市上空的痛”.据报道:一个30g的鸡蛋从25楼抛下可使人当场死亡.是因为:鸡蛋的 ____ ,重力势能与高度有关,下落过程 ____ ,动能大,所以危险性大.
目前全世界拥有多少个国家和地区( )