根据对话内容，从方框中选择5个恰当的句子完成对话，并将所选句子前的字母代号写在答题卡上的相应题号后.

A：We have to meet the others at 8：30 at the reserve(自然保护区)，don’t we?

B： 1

A：Do you know how to get there?

B：2  It will take us about two hours to get there by bus.

A：3

B：It’s an area that protects lots of different animals.

A：4

B： I’m not really sure.I know there are many different kinds of birds there and I’m going to take my camera with me.

A：5 What clothes are you going to wear?

B：Well，if it’s wet，I will wear my strong shoes and take my raincoat with me.

A：So will I.

N_A表示阿伏加德罗常数，下列叙述正确的是（　　）

A．22.4L的N₂和CO所含分子数均为N_A

B．1.7gH₂O₂中含有的电子数为0.9N_A

C．标准状况下，11.2LH₂O含有的分子数为0.5N_A

D．含有N_A个氦原子的氦气在标准状况下的体积约为11.2L