How silly it is to travel out by high-speed rail _____you can take a plane,whichis much cheaper.A.while B.when C.since D.though答案选B，可是C有既然的意思也能说通为什么不选？
1)Deinocheirus
had a rounded hump or "sail" on its back.2)hump:
round raised parts on a person's or animal's back.我查了很多资料，网上也看了，各种词典也看了，始终没搞清楚当用作形容词，表示圆的含义时，round和rounded究竟有什么区别？麻烦专家老师...
He phoned us to attend the meeting as scheduled.He phoned me to say the meeting would be postphoned.请问这两句用的都是 phone sb to do sth，但其中不定式的用法是不同的，对吗？我指的是它们的句子是不同的，对不对？请老师分析一下，谢谢！
...题。C. Have a rest. 休息一会儿。4. Which tour does
the man seem to be interested in? 这个人似乎对哪种旅游感兴趣？A. The evening tour. 夜游。B. The half-day tour. 半日游。C. The full-day tour. 全日游。5. Where are the
speakers? 对话的人在什么地方？A. At a ca...
有一道填空题：
Thousands of people were killed and many more left _________ (home) by the earthquake.
答案是填形容词homeless，但为什么不是副词homelessly呢？这里不是用于修饰动词left吗？为什么不用副词来修饰呢？谢谢解答！
Some people obsess over knowing the exact time. They buy clocks and watches that automatically adjust themselves over the Internet or by radio waves. These measurements allow them infinitesimal accuracy in dealing with time.最后一句是什么意思？是说这些方式处理时间非常不精准...
We are also doing the same with other vital resources not usually thought of asbeing nonrenewable such as fertile soils, groundwater and the millions of otherspecies that share the earth with us.本句中not部分是并列句还是并列表语呢？thought在这里应该是名词吧？