Herr Otto had (invented) an engine which ran on petrol.

单项选择题Trade secrets should not be discussed (in public).

单项选择题If someone on the network,using another computer,wants to use one of the files on the server,his or her computer would (retrieve) that file from the server.

单项选择题The family did everything possible to try to (convince Atzel) that he was alive, but he refused to believe them.

单项选择题The idea that knowledge is dangerous are deeply embedded in our culture.

单项选择题Among various thing in life, friendships and freedom are what he cares most about.

单项选择题Whatever new technology is introduced, it is not for scientists to make moral or ethical decisions.

单项选择题Autumn’s parents didn’t permit her to date and insisted Autumn（）Japanese school on Saturdays.

A.attend
B.attends
C.attending
D.to attend

单项选择题According to the passage, why is light coloring an advantage to large desert animals?

单项选择题TCP IP application layer protocols include the following except ( ).

单项选择题A backup program ( ).