“自同光以迄宣统，妇女服饰，以上海为最入时，流风所被，几及全国。宝贵之家，莫不尤而效之，其人辄顾影自怜，私心窃喜，贫贱者亦步趋恐后。”上述现象出现的主要原因是（  ）

—I haven't worked the problem out yet. What am I supposed to do?

—Try again! It’s only         difficult.

根据短文判断正（正确）误（错误）。

A: Good morning, Tom.

B: Good morning, John. Where are you from?

A: I'm from America, And you?

B: I'm from London.

A: What's Big Ben like?

B: It's tall and old .

A: Do you know London Bridge?

B: Yes. It's falling down.

A: It's very famous.

B:Yes. Welcome to London.