Doctors say that exercise is important for health, but it must be        exercise.
#19476
A
frequent
B
normal
C
regular
D
usual
推荐题目
They asked me so many _____ questions that I got _______ at last.
#19265
A
confusing, confusing
B
confused, confusing
C
confused, confused
D
confusing, confused
Arrogance and pride are similar in meaning, but there is _____ difference between them.
#20511
A
a submerged
B
an indecisive
C
an indistinct
D
a subtle
People tend to live more happily and longer if they are ________ about life. 
#19244
A
pessimistic
B
enthusiastic
C
optimistic
D
terrific