【题目】Only by constant study and changing our ideas can we________ to a changeable environment.
A.attend
B.adapt
C.agree
D.admit

【答案】B
【解析】A. attend to处理，照料；B. adapt to适应；C. agree to同意；D. admit to承认，许可进入；句意：只有通过不断学习和改变我们的观念，我们才能适应环境变化。根据句意，故选B。