And last year Khan Academy and the College Board unveiled a free course they say boosts SAT scores for students at all income levels.这里的黑体部分是插入语吗，如果是为什么没有逗号呢？如果不是那是什么成分?
...老师指点。
1. Each
airplane must be checked out seriously before taking off.
2. Residents
firmly oppose setting up waste incineration plant nearby, because they are
concerned about the emission polluting the air.
3. In
this area, the investment of ecological project...
...by Pierre-Auguste Lamy, shows the third act, set in
Venice, as illustrated forthe first production of the opera in 1881. 如果按现代语法来分析这个句子末尾的as分句，是否是as分句作比较状语分句，修饰set in Venice这个ed分句？这样分析正确吗？还是说后...
... invention cannot be copied or sold without his or her agreement. The item for exchange is that the possessor must make the information of this invention known to the public. The invention must be practical and include (be of) new characteristics/features--something that has never been exsited or us...
...e Rex Tillerson addressed a special meeting at the United Nations, calling for increased pressure on North Korea.上句中的calling逻辑主语不是主句主语，这可以吗？再请问老师，came hours after是怎样的句法成分关系。
...he Potters. Mrs. Potter was Mrs. Dursley’s sister, but they
hadn’t met for several years; in fact, Mrs. Dursley pretended she didn’t have a
sister, because her sister and her good-for-nothing husband were as
unDursleyish as it was possible to be.最后的句末是 as...as it was possible to
be...
...nbsp;are repeated,there are dozens of tracks forthe same animal.You'd expect just one clear illustration if the reason - the aim - was to teach tracking.为什么这两...
...then do the cleaning up
while I do my studying.I want a wife who will care for me when I am sick and sympathize with
my pain and loss of time from school. 请教老师，serve them pleasantly 是什么意思？其中them指的是什么？这里的serve含义和用法是什么？ loss of time
from sc...
...oduct, value is added, thus creating more wealth.③There has been no rain for thirty days in the area.
Thus the crops are likely to suffer.我看到语法书对thus的定义是：thus后面是根据上下文所作的推论。thus是表示推论的连接性状语。➱请问thus只有这一种语法...
Our society would be better off but forthe fact that the economy ______ by the current global financial crisis.A. had been affected B. were affectedC. should be affected D. is affected这道题目答案是...
...句首作为主语？要是我的话，我会这样写：It is first time for human to land moon more than 50 years ago.把一个这么长的名词性短语【The first human moon landing】作为主语合适吗？要是直译这个名词性短语的话，就变成【第一次人类月球登陆】...