题目内容

n. a line that separates two countries, etc.; the limit of sth, especially the limit of what is known about a particular subject or activity

A. fragment
B. frontier
C. fountain
D. friction

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v. to recognize sb/sth and be able to say who or what they are

A. identify
B. insert
C. inhabit
D. inherit

v. to take a firm hold of sb/sth; to understand sth completely

A. freeze
B. grasp
C. gaze
D. grind

n. the back part of the foot below the ankle

A. horn
B. heel
C. halt
D. hare

v. to become hard, and often turn to ice, as a result of extreme cold; to make sth do this;

A. infect
B. harden
C. freeze
D. grind