[单项选择]Maybe you have been to many countries, but nowhere else ______ such a beautiful palace.
A. can you find
B. you could find
C. you can find
D. could you find

[单项选择]Maybe you have been to many countries, but nowhere else ______ such a beautiful palace.
A. can you find
B. you could find
C. you can find
D. could you find

[单项选择]There have been many great inventions, things that changed the way we live.
A. 有许多伟大的发明，这些发明改变了我们的生活。
B. 有许多伟大的发明，一些事情改变了我们的生活方式。
C. 有许多伟大的发明家，我们从此改变了生活。
D. 有许多伟大的发明家，改变了我们的生活道路。

[单项选择]"During last decade, there have been many changes in family life.""Are these changes ________ "
A. for the good or for the bad
B. for the worse or for the better
C. for worse or for better
D. for the worst or for the best

[单项选择]

There have been many great (21) . The first great invention was one that is still very important to day--the wheel. This made it easier to carry (22) things and to travel long distances.
In the early 1800s the world (23) to change. There was little unknown land left in the world. People did not have to explore much any more. They began to work instead to make life belier.
In the second half of the 19th century many great inventions were made. Among them were the camera, the electric light and the radio. These all became a big part (24) our life today.
The first part of the 20th century saw more great inventions: the helicopter in 1909, movies with sound in 1926, the computer in 1928, and jet planes in 1930. This was also a time (25) a new material was first made. Nylon came out in 1935. It changed the kind of clothes people wore.
The middle part of the 20th century brought new ways to help people (26) disea
A. while
B. when
C. where
D. at

[单项选择]Up to now there have been many explanations ______ the cause of sleepwalking.
A. in view of
B. in line with
C. apart from
D. as to

[单项选择]You have been allocated a /22 network.How many usable hosts are available?（）
A. 510
B. 512
C. 1022
D. 1024

[单项选择]How many uncertified teachers have been fired


A. 750.
B. 950.
C. 370.
D. 290.