题干
根据对话内容，从方框中选择恰当的选项补全对话，其中有两项多余。
A：Nick!____
B：I'm watching Animal World． It's my favorite TV program．
A：____I need your help．
B：OK，Mom．____
A：I have to buy some milk for your little sister．____
B：No problem!
A：I'll be back in half an hour．
B：I see．____
A：Yes，but don't make her cry(哭)．
B：OK．
A．What can I do for you? B．What are you doing? C．Could I play games with her? D．Could you please not watch TV now? E．Why do you look so tired? F．Could you please look after her for a few minutes? G．Could I do the dishes? |
答案(点此获取答案解析）
B,D,A,F,C
的离心率为
，左、右两焦点分别为
，抛物线
以
为顶点，
为焦点，点
为抛物线与双曲线右支的一个交点，若
，则