单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．About four days.
B．About three days.
C．About two days.
D．About one day.
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单项选择题
A．She is too busy with her work and can not go.B．She wants him to check whether it is going to rain.C．She will surely enjoy the picnic tomorrow.D．She wants the man to help her.
A．She is too busy with her work and can not go.
B．She wants him to check whether it is going to rain.
C．She will surely enjoy the picnic tomorrow.
D．She wants the man to help her.
填空题
What makes scientists more concerned about energy blend
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