A:
B:
中南半岛城市大多分布在( )
--- Will the new iphone cost a lot?--- I ________ think so. Apple's products are usually expensive.
45÷9=____
根据所学知识回答下列问题:酒精灯是实验室常用的加热仪器,当实验结束需熄灭酒精灯时,应____ 。