水分在植物体内有自由水和束缚水两种状态，当自由水含量高时，植物的新陈代谢旺盛。
参考答案：对
It’s reported that by the end of this week the stock exchange________ by about 10％.
A．will have risen
B．has risen
C．will be rising
D．has been rising
梯子上最多允许（）人作业。
A、1
B、2
C、3
D、4
