It is reported that in our country cities ________ heavy air pollution that is 30 percent above the national standard or higher should try to meet standards by 2030.
#13946
A
suffering
B
suffer
C
suffered
D
are suffering
推荐题目
Achieving a high degree of proficiency(精通）in English as a foreign language is not a mysterious _______ without scientific basis.
#11851
A
process
B
practice
C
procedure
D
program
. ---Here you go. There are______ such cards here. --- I only need ______ these cards in the box.
#14400
A
five dozens; one dozen
B
five dozens of; one dozen of
C
five dozen ; one dozen
D
dozens of ; one dozen of
. _________ is known to all, good friends _________ happiness and value to life.
#12695
A
It; add
B
As; add
C
It; add to
D
As; add to
(2010·山东)That's the new machine ________ parts are too small to be seen.
#11565
A
that
B
which
C
whose
D
what