please call Karen ______ 555-3937.please call Karen ______ 555-3937.A.at B.with C.for D.on选哪一个?为什么?

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• please call Karen ______ 555-3937.please call Karen ______ 555-3937.A.at B.with C.for D.on选哪一个?为什么?
• Students are to create a three dimensional model of one of the first ten atoms.(H-Ne) models must clearly show the protons,neutrons and electrons in their correct locations.This motal must be either hanging from a string or be able to stand by itself.Models must not be made from objects found in student's desks,and they must be labeled with the name of the element,and the name of the students.Help
• 翻译句子——如果你想为电视台工作,请拨打555-3256联系我们 （work,for,call at）