以下四个结论：

①若a⊂α，b⊂β，则a，b为异面直线；

②若a⊂α，b⊄α，则a，b为异面直线；

③没有公共点的两条直线是平行直线；

④两条不平行的直线就一定相交．

其中正确答案的个数是（　　）

到南极地区科学考察的最佳时间大约是（　　）

    During the summer holiday，Alice had a nice trip．First she took a plane from Changchun to Beijing．She went to the Great Wall．She was very tired．But she was  happy．She likes Beijing very much．Then she went to London by plane．She visited Big Ben，the clock tower．There were many museums in London．She learnt a lot there．People in London love eating fish and chips．She stayed in London for 5 days．Then she took a plane to Shanghai．Then she went to Changchun by plane．

根据短文，判断正误。

解释下列划线字。

奈何忧其坏____     地，积块耳____