失血性休克早期会出现
A．碱中毒B．酸中毒C．皮肤湿冷D．血压下降E．合并感染
参考答案：B
They were abroad during the months when we were carrying out the investigation, or they _____ to our help.
A．would have come
B．could come
C．have come
D．had come
萝卜叶光合作用释放的气体是（ ）
A．二氧化碳
B．氧气
C．水蒸汽
D．氮气
