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1.Instead of ornaments, they have decorated the trees with meatballs and mealworms.

Instead of 代替

Many teachers are opting for group discussions instead of handouts.

许多教师选择组织小组讨论，而不是发讲义。

2.Zookeepers have hung Christmas trees in the animal habitats.

habitats 栖息地

The habitats of many of these creatures have also been affected by man's activities.

人类活动也对这些生物的栖息地造成影响。