People who leave home in the morning slamming doors behind them

People who leave home in the morning slamming doors behind them are likely to be less _______ than those who leave home with a smile.(product)
【正确答案】：productive
【题目解析】：译文：比起那些早上笑着离开家的人，那些早上出门之前摔门的人的工作效率很可能会较低。本空用于less后，可知此处要用形容词productive。答案为productive。