根据对话内容，从对话后的选项中选出能填入空白处的最佳选项，并在答题卡上将该项涂黑。选项中有两项为多余选项。

一Hello.Gerry speaking．

一Hdlo．Gerry．It’s me John here．1

一Well．I’m terribly sorry．bat I’m not feeling very well．

一Is that all? 2

一No．I’m sony．I was sick all night．I think it must be the fish I ate last night．

一Well．I think you should have at least phoned Kate and told her you weren’t coming to the meeting．

----3  I’m sorry about that．Anyway，I think I’ll be able to get in to work tomorrow．

一4

一I won’t．Thanks for calling．

一5

A．Why didn’t you phone?

B．OK．Take care and don’t eat any more fish．

C．Why aren’t you here at the meeting?

D．That’s all right．E．We thought you might have had an accident or forgotten the day or something.

F．I’ll be glad tosee you again.

G．Yes．I suppose I should have done so.

某气体的摩尔质量为M，摩尔体积为V，密度为ρ，每个分子的质量和体积分别为m和V₀，则阿伏加德罗常数N_A可表示为 [ ]

A．

B．

C．

D．