受众不充当哪个角色（）.
A.消费者
B.制造者
C.译码者
D.反馈者
参考答案：B
句型转换。
1. My cousin and I are different. (变否定句)
My cousin and I ____________ ____________ different.
2. They go for a walk in the evening. (变一般疑问句，作肯定回答)
____________ they ____________ for a walk in the evening?
____________, ____________ ____________.
4.7×99+4.7．
