2011年9月中国中医研究院首席研究员屠呦呦因为发现青蒿素———一种治疗疟疾的药物获得拉斯克临床医学奖，这是中国生物医学界迄今为止获得的最高级世界级大奖．疟疾是通过吸血的动物进行传播而引起的传染病，其属于（　　）

D

    Some people learn a foreign language easily. Others may not. How can you help yourself learn English? I think there are two ways to make learning English a little easier and more interesting.

    First, you should build up confidence（自信）. If you believe that you can learn, you will learn. When you read or listen to something, you may not be able to understand（理解） it all. Don't worry. You can use a dictionary to help you. You can ask your teacher or friends to help you. Do not be afraid of making mistakes. You can learn from mistakes.

    Second, practise using English. For example, write a diary in English every day, and you'll be able to write better. Speak English whenever you can. You may practise with your friends after class. Then you'll be able to speak better.

    Remember the famous saying, "Practice makes perfect." The more you practise using English, the better you'll learn it.

在南极顶上，你的前后左右各为何方（ ）