1.President Obama will also visit the largest mosque in Sout

1.President Obama will also visit the largest mosque in Southeast Asia before heading over to the University of Indonesia to deliver his speech.话中的head over 为什么不用head to?
2.When you visit a place that you spent time in as a child.that引导的是什么从句?怎么看的?
3.Followed more than 3,000 study participants in their 20s and 30s,rating their time urgently and impatient levels by asking these four questions.这是什么句子?（选自 CNN 生活节奏快导致心脏病）
4.You're twice as likely to develop hypertension compared to those who answered no.此句中的as是什么用法?

1.这里 over 表示 有一段距离 head over to是 前往 的意思 head to的意思 就是 去
2.that引导的是定语从句,并作定从中介词in的宾语
3.主语省略了 其中 rating their time.是现在分词作 状语
4.You're twice as likely to develop hypertension compared to those who answered no.此句中的as是副词 修饰形容词 likely.As many as 350 可以看做形容词 也就是 中心词 是many