至虚有盛候属于()。
A.虚实转化
B.虚实错杂
C.真虚假实
D.真实假虚
E.上虚下实
参考答案:C
—The Summer Palace is wonderful. Have you ever visited any other interesting places?
—Yes. Also, we _______ to the Great Wall. [ ]
A. have gone
B. have been
C. had gone
D. had been
某研究单位把蔬菜大棚中空气中CO2浓度提高3﹣5倍,让O2的浓度尽量减少(或用其他方法收集起来),结果使农作物的葡萄糖产量大大提高.下图为光合作用的方程式:
试依据光合作用的方程式分析解释这种现象 ____ _____ .