题目：In Unit 8, why is the doctor accused of doing animal research?
He is thought of having no moral compass.
He tortures innocent animals for his career advancement.
His expeirements have nothing to do with medicine.
All of the above.
题目：In Unit 8, why is the doctor accused of doing animal research?
He is thought of having no moral compass.
He tortures innocent animals for his career advancement.
His expeirements have nothing to do with medicine.
All of the above.