单选题
_________
A．in time
B．overtime
C．at times
D．behind time
参考答案B
解析:
介词词组辨析。in time意为“及时”；over time意为“随着时间的推移”；at times意为“有时”；behind time意为“误时，晚点”。原文指出：为了应对那些“欺骗”，随着时间的推移，这些植物逆转了碳的流动方向。0ver time符合题意。
你可能喜欢
A．
[ A] Because the general public often show no interest in such matter
B．
[ B ] Because the heating rights of the public are adversely affecte
C．
[ C ] Because the public has stamped the documents "official use only".
D．
[ D ] Because the public are not aware of the changes in the first plac