—What do you think of the book, Nancy?
—I think it's both useful and _______.
A：enjoyable
B：enjoys
C：enjoyment
D：enjoyed
教育家、心理学家华生曾经说过，给他一打健全的孩子，他可以把他们培养成律师，也可以培养成医生、商人、小偷……他的话从某种程度上来说是合理的。这表明（ ）
