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重点讲解：
1. be responsible for 负有责任的；应承担责任的；
Cigarette smoking is responsible for about 90% of deaths from lung cancer.
因患肺癌而死亡者，约90%是吸烟所致。
2. be similar to 相像的；相仿的；类似的；
The basic design of the car is very similar to that of earlier models.
这种汽车的基本设计与早期的样式非常相似。
3. depend on 取决(于)；有赖(于)；
Wage rates depend on levels of productivity.
工资水平取决于生产量的多寡。
4. switch to 转换；改变；转变；
Switch to paying your mortgage by direct debit.
改成用直接借记方式偿还抵押贷款吧。
