Question

選出能替換畫線部分的選項(xiàng)You can send him letters by Internet. That's fast and easy.

1. A.
   postcards
2. B.
   airmails
3. C.
   e-mails
4. D.
   ordinary letters

Answer 1

C
解析：
畫線部分指“網(wǎng)上信件”，即e-mails。