— ?
—She is having coffee.
A：What does she do
B：What is she going to do
C：What does she like doing
D：What is she doing
过度包装即浪费又污染环境，据测算，如果全国每年减少10%的过度包装纸用量，那么可减排二氧化碳3120000吨，把数3120000用科学记数法表示为（ ）
下列核反应方程中，属于α衰变的是（ ）
