Reading comprehension:According to Unit7（Text A）, choose the correct answer for the following questions.What does the sentence “These early vivisections appear to have been done mostly for exploratory purposes to describe the inner workings of animals”(Para.1) mean?

A、 The early vivisections were done to find out how the animals work inside the
lab.
B、 The early vivisections were done to find out how the animals work under people’s inspection.
C、 The early vivisections were done to find out the mental work of the animals.
D、 The early vivisections were done to find out the anatomical structures and physical functions of the animals.