用两个完全相同的电加热器同时给水和煤油分别加热,在加热过程中水和煤油的温度升高一样快,由此可以判定 ( ) (c水>c煤油、ρ水>ρ煤油)
The number of medical schools reached 18 in the early 1990s and ______ around that level ever since.( )
are remaining
have remained
is remaining
has remained
I never worried about my son while I was away because my mother ______ him.( )
drank a toast to
played a joke on
kept an eye on
made an apology to
According to Professor Johnson,we don't have to read the book if we don't want to,as it is ______.( )
worthwhile
necessary
optional
serious
Dr.Rowan,______ secretary resigned two weeks ago,has had to do all his own typing.( )
whose
of whom
of which
which
﹣Shall I order a taxi for Sarah to go to the airport tonight?
﹣______.I'll drive her there.( )
Have a try
Don't mention it
Don't bother
Go ahead