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【单选题】
设G= 为无,|V|=7,|E|=23,则G一定是( )。A.
完全图
B.
树
C.
简单图
D.
多重图
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【简答题】I didn’t do many household (1) as my mother wanted me to concentrate on studying __(2)__ school. But now when I get back home from __(3)__ , I try to do as much as possible , mopping __(4)__ floor, cl...
【简答题】阅读理解。 Canadians and Americans usually tip in places like restaurants, airports, hotels and hair salons because many people who work in these places get low salaries. A tip shows that the customer is p...
【简答题】I didn’t do many _(1)_ chores as my mother wanted me to concentrate on _(2)_ in school. But now when I get back home _(3)_ college, I try to do as much as possible, _(4)_ the floor, cleaning the windo...
【简答题】____和电子垃圾已经成为人类当下最大的敌人。
【单选题】When the delegates come, ______ help them sign the Registration Cards and collect their room keys.
A.
receptionists
B.
room attendants
C.
sales managers
D.
security guards
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