骨肿瘤好发部位为______，生长迅速的骨肿瘤最显著的症状是______。
参考答案：
．---It is reported that there is _____ big breakthrough in the cancer treatment．
---If only my son could be brought back to _____ life!
A．a; /
B．/; a
C．the; the
D．a; the
在开停车过程中要各压力应：（）>氧气压力>转化系统压力
