Directions: Read the passage carefully and then translate the underlined sentences into English or Chinese. Write your answer on your answer sheet.

Have you ever considered a trip to Shangri-la!? The British writer James Hilton described a beautiful kingdom 【1】.where three rivers joined together, steep mountains reached to the sky, and fields of long grass covered the earth. Three mountains, Meili, Baimang and Haba, which are covered with snow, tower over the land. Below the mountain, the sunshine reflects on the many lakes, 【2】.making them shine like diamonds against the rich countryside. Lakes, surrounded by vast grassland, look like jewels. Sheep, cows and horses feed freely on the green grass and 【3】.forests around are home to lots of birds and animals. In this peaceful world, 【4】. 人们与大自然和谐相处and the noise and the worry of the outside world are forgotten. Nature has provided Shangri-la with endless natural treasures, making the land a happy home for the local people. In this perfect world lived people who had discovered 【5】. 如何永葆青青.The weather changes so quickly that people say you can experience four seasons in one day. The best time to visit Shangri-la are spring and autumn when the temperature is at it mildest.

下列关于预防和清除计算机病毒的叙述中，正确的是（）。

A．专门的杀毒软件不总是有效的 

B．删除所有带毒文件就能清除所有病毒 

C．若U盘感染病毒，则删除其中的全部文件是杀毒的有效方法之一 

D．要使计算机始终不感染病毒，最好的方法是装上防病毒卡