As we all know, independence is very for youngsters because sooner or later they will leave their families and live alone.
A. essential
B. accurate
C. flexible
D. temporary
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(答案→)A. essential
B. accurate
C. flexible
D. temporary
解析：句意：我们都知道，青少年独立是非常必要的，因为他们迟早会离开他们的家去独自生活。essential意为“至关重要的”，accurate意为“精确的”，flexible意为“灵活的；柔韧的”，temporary意为“暂时的，临时的”。