________ with the size of the whole earth, the highest mountains do not seem high at all.
A、IfyoucompareC
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Tostudyaforeignlanguage,__________.
Idon'tknowhowwecanmake________onthetimetableforanymorecourses.
________somanypeopleintheUnitedStatesbeenoutofworkastoday.
The boy ran out of the classroom without the teacher's _______.
It is useful to science _______ the earth as an object in space.