Herdsmen and hunters have also long observed that grazing animals often tend to align themselves facing either north or south, which the researchers suspected was in readiness to escape in either of those directions should a threat emerge.请问：如何分析与理解粗体部分的从句呢？
People are invited to query Marilyn vos Savant, who at age 10 had tested at a mental level of someone about 23 years old; that gave her an IQ of 228 - the highest score ever recorded.这里的that是引导词还是代词呢？如果是引导词那么先行词是什么？
专家请看这句话（摘自考研英语某篇文章）：Or, put another way, expert performers—whether in memory or surgery, ballet or computer programming—are nearly always made, not born.【参考译文】换句话说，不管是记忆还是动手术，不管是跳芭蕾还是计算机编...
...;Not only are Americans far more likely to focus on their children‟s intelligence and cognitive skills, they are also far less likely to describe them as “happen”&n...
He held on to the back of a chair (他抓住椅背)(新牛津词典例句)Hold tight to the railing, or you'll slip and fall.(章振邦新编高级英语语法384页)我想不通，为什么以上2个例句，hold后面要用介词， 为什么不是直接抓住某个东西，加了介词to为何？
Now, take thattobacco jar on the table, for instance. What I want to know is whether what I am going to do with it is a miracle or not.老师，辅导书上说，what在 what I am going to do with it 这个从句中做to do 的宾语，有点不明白，不是do with it是一个固定的搭配吗...