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！
有人形象地说南京既是中国近代史的起点，也是中国近代史的终点。对于南京，下列说法不正确的是（ ）
澳大利亚出口的矿产主要是____。
下列溶液中Na+与50mL 3mol•L﹣1 NaCl溶液中Na+物质的量浓度相等的是（ ）
