一般二氧化碳中毒的主要特征为（）。
A.急性中毒
B.慢性中毒
C.反复性中毒
参考答案：A
—Betty told me the last mountainous bike you preferred to yesterday was bought by John.
—Oh, my! How I regret that I didn’t buy ______.
A．that
B．such
C．one
D．it
