...第一段President Vladimir Putin signaled Russia will aim new weapons at the U.S. if it stations missiles in Europe after quitting a landmark Cold-War-era treaty, amid growing fears of a new arms race.
station missiles与put missiles表达一致那么，为什么station用了一般现在式？
It was not until man had learned how to make iron and steel that the constructionof various machines _ possible.A.were madeB.had madeC.madeD.was made请老师帮我仔细划分句子成分再逐一给四个选项解答，最后在详细说明not until的用法，谢谢。
2016年text3句子It argues that since prosucutors do not consume a company's products as part of their investigations, they could be influenced by the halo effect. 为什么consume前不加see或者regard？
Although scientists have known for a long time that about 2% of people suffer from face - blindness, which means that they have huge problems recognising faces, they are only new realising that some people are the exact ones.这三个that的作用是什么呢？
The globalization of education means more universities will be seeking heads with international experience of some kind to promote international programs and attract a global student body.句子有些复杂啊！with international experience of some kind 介词短语是做状语还是定语？ ...
Despite official data showing the unemployment rate was 6 percent in April, up to 10 percent of people officially employed in China could actually be out of work，
...as banking,telecons, and air travel ,information protection is now high on the boss’s agenda in businesses of every variety.这里的形容词为什么要用逗号呢？是因为都是观点（主观）形容词嘛？如果是的话意思就是用多个观点形容词都要用逗号隔开吗？
Chinese President Xi Jinping and Nepalese President Bidya Devi Bhandari jointly announced the new height of Mt. Qomolangma, which is 8848.86 meters, in letters they sent to each other on December 8.老师您好，请问这里的letters后面省略了引导词吗？是where吗，引导定语从句。