背1遍就想上考场四级单词 Week 3 Day 6_134 

[00:02]heighten [00:06]Steroids and other supplements are often administered [00:10]to the birds to heighten their aggression. [00:15]threaten [00:17]Open spaces are threatened by plans for housing estates [00:22]and important habitats are endangered by highway construction. [00:29]weaken [00:30]Stress will weaken the body's defense against germs. [00:37]waken [00:39]Michael said he climbed a tree outside Martha's bedroom [00:43]and tried to waken her by throwing pebbles at the window.

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