1. The postal postage standard for domestic and foreign printed matter in our country is as follows: 0.7 yuan for up to 100 g, and an additional 0.4 yuan for each additional 100 g (any weight less than 100 g is counted as 100 g). A person is mailing a book from Chengdu to Shanghai, and the book weighs 470 g. The postage he should pay is ( ) yuan.
(A) 2.3
(B) 2.6
(C) 3
(D) 3.5
1. A. Since $470=100+3 \times 100+70$, the postage is $0.7+3 \times 0.4+0.4=2.3$ (yuan).