_____ three influenza type A virus subtypes（子类型） have been found in pigs．
#27191
A
By far
B
As far as
C
So far
D
Till far
推荐题目
You can change your job，you can move house，but friendship is meant to be________life. (2012·安徽，25)
#25259
A
of
B
on
C
to
D
for
The student, ＿＿＿＿whom all the teachers are pleased,is very strict ＿＿＿himself ＿＿＿ everything.
#28819
A
to； with； in
B
with； with； in
C
with； at； with
D
at； with； at
The invention of artificial hearts marked a turning point in the battle heart disease.
#27040
A
among
B
for
C
against
D
between
_____ his knowledge of the mountainous country, John Smith was appointed as our guide.
#29086
A
In spite of
B
On account of
C
Regardless of
D
In place of
___ the help of computers , there are no ___ problems.
#26921
A
Under; so
B
Under; many
C
With ;such
D
With ;some