皮皮学，免费搜题
登录
搜题
【单选题】
选择的代价,称为()A.
沉默成本
B.
机会成本
C.
会计成本
D.
边际成本
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Which of the internal skills is NOT mentioned in this passage?
A.
Networking.
B.
Public speaking.
C.
Writing.
D.
Cross-culture travelling.
【简答题】单词翻译：mechanical power
【单选题】The English teacher focuses his teaching ______on improving students' listening and speaking ability.
A.
remarkably
B.
instantly
C.
exclusively
D.
initially
相关题目：