某猪场2～5月龄猪出现发病，病猪首先发生喷嚏，特别是在饲喂或运动时更明显，鼻孔流出少量浆液性或脓性分泌物，有时含有血丝，不时拱地、搔扒或摩擦鼻端。经数周，少数病猪可自愈，但有少部分病猪有鼻甲骨萎缩的变化。经过2～3个月后出现面部变形或歪斜。若两侧鼻腔严重损害时，则鼻腔变短，鼻端向上翘起。剖检表现鼻腔软骨和鼻甲骨软化和萎缩。特别是下鼻骨的下卷曲最为常见，严重甚至鼻甲骨消失，鼻中隔发生部分或完全弯曲，鼻腔成为一个鼻道。有的下鼻甲骨消失，只留小块黏膜皱缩附在鼻腔的外壁上。
该猪场猪所患疾病可能是
A．猪传染性萎缩性鼻炎
B．猪喘气病
C．猪传染性胸膜肺炎
D．副猪嗜血杆菌病
E．猪圆环病毒病
参考答案：A
| 任务型阅读 根据短文内容，从短文后的A-F选项中选出能填入空白处的表示该段主题句的最佳选项。选项中有一项是多余选项。 | |
The biggest problem most people face in learning a new language is their own fear. They worry that they won’t say things correctly or that they will look stupid so they don’t talk at all. Don’t do this. The fastest way to learn anything is to do it - again and again until you get it right. Like anything, learning English requires practice. Don’t let a little fear stop you from getting what you want. 2. ________ Even if you study English at a language school it doesn’t mean you can’t learn outside of class. Using as many different sources, methods and tools as possible, will allow you to learn faster. There are many different ways you can improve your English, so don’t limit yourself to only one or two. The internet is a fantastic resource for virtually anything, but for the language learner it's perfect. 3. __________ The absolute best way to learn English is to put yourself in it. Take notes in English, put English books around your room, listen to English language radio broadcasts, watch English news, movies and television. Speak English with your friends whenever you can. The more English material that you have around you, the faster you will learn and the more likely it is that you will begin “thinking in English.” 4. _________ This is not only a fun way to learn but it is also very effective. By watching English movies (especially those with English subtitles) you can expand your vocabulary and hear the flow of speech from the actors. If you listen to the news you can also hear different accents. 5. ________ Another very effective method of learning English is singing. In fact, it is often used as a way of improving comprehension. The best way to learn is to get the lyrics (words) to the songs you are listening to and try to read them as the artist sings. There are several good internet sites where one can find the words for most songs. This way you can practice your listening and reading at the same time. |