国开《 综合英语(3)》Unit12 单元练习 形考试题 【题目】As a defense against air-pollution damage, many plants and animals______ a substance to absorb harmful chemicals. relieve release dismiss discard 试题来源 综合英语(3) 查看整套课程试卷 此内容查看价格为0.2金币,请先登录如有问题,请联系微信客服解决!