生物化学是研究生物有机体的（）与（），以及（）内所发生的（）的科学。
参考答案：化学组成；性质；机体；化学变化
The last thirty years _____ the greatest number of laws stopping our rights and progress. Until today we have reached a stage _____ we have almost no rights at all.
A．saw; which
B．see; where
C．are seeing; in which
D．have seen; where
