单选题The “tissue factories” in the second paragraph most probably refers to ______.A the five genetically identical piglets.B places for the production of tissues.C animals whose organs would be used for human consumption.D animals which would be raised in
题目
单选题
The “tissue factories” in the second paragraph most probably refers to ______.
A
the five genetically identical piglets.
B
places for the production of tissues.
C
animals whose organs would be used for human consumption.
D
animals which would be raised in quantity for transplant materials.