When ______ comes to research into heart disease and its effects on the body, we do not have adequate substitutes for the use of animals.
#93492
A
that
B
it
C
this
D
what
推荐题目
I had _________ entered the classroom when I noticed the headmaster was sitting at the back.
#94812
A
still
B
yet
C
sooner
D
hardly
.We don’t have to feel curious about him. Actually he leads _______ we ordinary people do.
#94180
A
as a life normal as
B
as normal as
C
as normal a life as
D
as a normal life as
___ no need for us to discuss the problem again. It has already been settled.
#94599
A
It has
B
There has
C
It is
D
There is
—Do you have any idea what Paul does all day?—As I know,he spends at least as much time playing as he______.
#94675
A
writes
B
does writing
C
is writing
D
does write