Students taking the course _____to finish their homework with the help of computers．

A．are encouraged

B．have encouraged

C．are encouraging

D．had been encouraged

Directions：For this part，you have to write a short passage．You should write at least 150 words following the outline given below in Chinese：
1．现在越来越多的年轻人把手机短信作为交流的主要渠道；
2．使用手机短信的利与弊；
3．你的观点。