1．harmful adj.有害的
[教材原句] What many scientists believe is that the continued presence of water allowed the earth to dissolve harmful gases and acids into the oceans and seas.
很多科学家相信，由于地球上长期有水存在，使地球得以把有害气体和酸性物质溶解在海洋里。
(1)be harmful to 对……有害
(2)harmless adj. 无害的
(3)harm n. &vt. 伤害
(4)cause/do harm to... 对……造成伤害/有害
do harm to sb.＝do sb. harm 对某人有危害
mean no harm 无恶意
There is no harm in doing sth. 做某事没有害处
单句语法填空
①Some boys are too crazy about playing games on the computer, which is very ________(harm) to their health.
②These days, breaking traffic rules and littering are not uncommon, causing serious harm __________ the environment.
③If you want to solve the problem in this way, there is no harm ________ calling him.
[答案] ①harmful ②to ③in
