A:Look! This is the flag of ____. Do you know?
B:Yes, I ____ about it. It has five yellow stars.
A:What is the capital ____ of China?
B:It's Beijing. Tian'anmen Square is in Beijing. It's ____ .
A:What do you ____ ?
B:Chinese.
A:Great!
联合国卫生组织经过严密的科学分析,认为我国的铁锅是最理想的炊具,其主要原因是( )
下列关于电磁感应的论述中,正确的是( )