【单选题】There are twenty girls in the classroom. Some are cleaning the tables, and __ __ are sweeping the floor. [ ]
【简答题】A.Because some book in the library are very expensive. B.Because some books in the library are rare. C.Because sometimes students need certain materials urgently. D.Because some students won't return ...
【单选题】The students are doing the cleaning in their classroom. Some are cleaning the windows and the doors, _______ are sweeping the floor.
【单选题】While there are some differences in the educational systems in many countries in the world, education itself is ______.
【简答题】仓库储存费用的构成中,( )是最难确定和测量的。
【单选题】The measures taken by government in some states in the second paragraph are for the purpose of
A.
protecting people's convenience
B.
protecting the cars and motors
C.
protecting cyclists' safety
D.
protecting the flowing of the traffic