单选题
12、Their actions （ ）the stability and security of the region.
参考答案
D
题目详解：
句意：他们的行为对这一地区的稳定和安全造成威胁。
harden v. 变硬，变严厉 He hardened his voice.
frighten v. 使惊恐 She doesn’t frighten easily.
brighten v. 使更明亮 brighten up 增添乐趣
A letter will usually brighten up a person’s day. 使人一天心情愉快。
threaten v. 威胁 The attacker threatened them with a gun.
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