If parents are not careful, children tend to neglect their homework.

单项选择题The doctor explained to the students the hazards of radiation upon human beings.

单项选择题The very north and south regions are covered with ice and snow.

单项选择题Argument among the speakers at the conference is bordering on violence.

单项选择题You could condense all the worthwhile information in this book into a few pages.

单项选择题She was one of the leading writers of her day.