单项选择题Which of the following statements is true according to this passage
单项选择题It can be inferred from this passage that ______.
单项选择题Which of the following can serve as one of the reasons to support the idea that theories are like apples
单项选择题Some features of a theory may be considered very important if they are ______.
单项选择题Which of the following cannot be used to explain what a theory is like