皮皮学，免费搜题
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【多选题】
风险资产的有效边界是A.
在最小方差资产组合之上的投资机会
B.
代表最高的收益/方差比的投资机会
C.
具有最小标准差的投资机会
D.
具有零标准差的投资机会
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】---What do you think of the waiter over there? ---I don’t think he is a qualified one. Hewas talking __________ while taking my order.
A.
with a phone
B.
on the phone
C.
about a phone
D.
by the phone
【单选题】---What do you think of the waiter over there? -I don’t think he is a qualified one. He was talking __________ while taking my order.
A.
by the phone
B.
with a phone
C.
on the phone
D.
about a phone
【简答题】根据对话内容，选择正确的句子，将其序号填入横线上，补全对话。 A. It's next to the cinema. B. What are you going to do after English class? C. Then walk straight for five minutes. D. Get off at the hospital. E. Where is the bookstor...
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