— Is it good to look up every new word when I come across it in reading?

—No，you _____，because you are likely to guess the meaning from the context,

A．don't have to

B．shouldn't

C．can't

D．mustn't

股价同为10元股的A、B两只股票，当前市盈率分别为40倍和20倍。 问：(1)其每股收益各为多少 (2)如果从现在开始，A股票的每股盈利以每年比上年高40%的速度增长，B股票每股盈利以每年比上年高20%的速度增长，在市盈率不变的假设下，3年后，两者的股价将相差多少