造血干细胞分化为脑星型胶质细胞和红细胞是指( )。
A.干细胞的再分化
B.干细胞的去分化和转分化
C.干细胞的转分化和分化
D.干细胞的去分化
E.干细胞的分化
A.干细胞的再分化
B.干细胞的去分化和转分化
C.干细胞的转分化和分化
D.干细胞的去分化
E.干细胞的分化
第1题
I wonder how long ago this school ______.
A.has begun
B.begins
C.had begun
D.began
第2题
I wonder how Mrs. Brown has been ______ in hospital.
A.getting off
B.getting across
C.getting on
D.getting through
第3题
It frustrates me that I‘m not able to put any of my ideas into practice.
A.discourages
B.shows
C.surprises
D.frightens
第4题
"We' re late and the play has started."" I wonder how long ago______."
A.did it begin
B.it began
C.was it beginning
D.it has begun
第5题
I wonder how many years ago _______.
A.did you father retire
B.your father retired
C.has your father retired
D.your father has retired
第6题
I wonder how much ______ .
A.that car was
B.was that car
C.is that car
D.that car is
第7题
I wonder how many years ago____________.
A.did your father retire
B.your father retired
C.has your father retired
D.your father has retired
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