当黑龙江冰天雪地时，海南岛上却鲜花盛开。造成我国南北这种差异的主导因素是（  ）

根据短文理解，完成下列各题。

    My name is Kitty. I have a very big and nice room and I have a great school things collection.

My brother's room is near my room. He is Mike. And he has a big sports collection. I have twenty erasers, ten pencils, nine rulers and eight pens in my schoolbag. My brother has two baseballs, four soccer balls and five basketballs under his bed.

I am on the way
I have been dreaming of being a volunteer1 I entered the university． Last summer, I could finally become a volunteer after the end　term  examination．
Step1 First experiencing
I thought I could have a good 2． But when I faced so many strangers, also my new workmates for the first time, I got nervous and  3almost all the time．
Step2 Start work
My first job of volunteering was 4 in summer． The kids were from families 5 low income(低收人)．They were at different 6，from primary school pupils to high school students．We talked about the 7，sadness and happiness．I told them that lessons were much more important than money，though I knew they did not have 8 lives．I 9that my experience would help them．
10，we needed to make better plans，and sometimes we didn’t know what to do at all，especially when11happened．
Step3 Wishes
I also12the older serving group．It seemed 13 more difficult to communicate with elders．I really hoped that I could bring14 happiness into their lives and help them more．
Anyway，I am on the way． 1 will15my dream，no matter what would happen the next day．