下列有关催化剂的说法中错误的是( ) A.催化剂就是二氧化锰 B.催化剂能改变其他物质的化学反应速度 C.在化学反应前后催化剂的质量没有改变 D.在
_____ with a camera, a compass and several maps, the scientists set out to explore the ancient forest. A. Equipping B. Having equipped C. Equipped D. to be equipped
将某绿色植物放在特定的实验装置中，研究温度对光合作用和呼吸作用的影响（其他实验条件都是理想的），实验以CO2的吸收量与释放量为指标。实验
下列条件中，能判定△ABC≌△DEF的是（ ） A．AB=DE，BC=ED，∠A=∠D B．∠A=∠D，∠C=∠F，AC=EF C．∠B=∠E，∠A=∠D，AC=EF D．∠B=∠E，∠A=∠D，AB=DE
--- I don’t care what people think. --- Well, you __________. People’s idea is of great value to you. A. could B. would
They may be just passing your office, computer bag slung (悬挂) over one shoulder. Or they may be sitting in a car outside it, causally tapping away at a laptop. They look like innocent passers-b
下列叙述中不正确的有 ①李白的诗豪迈奔放，想象丰富 ②杜甫的诗充满了忧国忧民的感情 ③阎立本的画立体感强，风格奔放，开后世写意画的先河 ④
“Dad，” I say one day，“let's take a trip. Why don't you fly out and meet me？” My father had just retired after 27 years as a manager for IBM. His job filled his day, his thoughts, his
平面
，直线
平面
，则“
”是“
”的