题目

蚜虫是世界上繁殖最快的昆虫，其种类众多，中国约有1100种，蚜虫用腹部管状结构吸食植物汁液，其天敌有瓢虫、昆虫病原真菌等，当一只蚜虫受到攻击时就会释放一种有警告作用的化学物质A，从而使邻近的蚜虫迅速逃避敌害。下列相关叙述正确的是（ ）A.蚜虫的种类众多体现了生态系统中种群的多样性B.蚜虫与宿主之间是寄生关系，与天敌之间是捕食关系C.人为释放物质A可增大蚜虫被捕杀的概率，属于生物防治D.因与蚜虫同一营养级的动物多，蚜虫A study of English learning problems was carried out among a total of 106 foreign students.It shows that most students considered understanding spokeu English to be their bigges problern on asrival.This was followed by speaking,Writing increased as a problem as students discovered difficulties in writing papers that they were now expected to hand in.Reading remained as a signifioant（显著的）problem. The information gsined helped up in determining where special attention should be paid in our course.Although many atudents have chosen to join the course with a reasonnble motivation（动机）,we considered it important to note what seemed to encourage inleresl.Neady all the students have experienced some kind of grammar-based English teaching in their own country.To use the sarnc method would be self-defeating because it might reduce motivation,especially if it has failed in the pest.Thereforc a different method may help henause it is different. Variety of activity was also seen as a way of maintsining（保持）or incressing motivation.Several years ago we had one timetable that operated throughout,but we soon found that both the students and the teachers lost interest by about halfway through the ten weeks.This led up to a majoc re-taink,so finally we hrought it into line with the expressed language needs of the students. 1.What is the text mainly about? A.Foreign students have more problems. B.There are many ways to improve English. C.Tesching should meet students’needs. D.English learning probles should be studied again. 2.Writing became a bigger problem when foreign students       . A.had to writs their paers B.became better at speaking C.became less interested in reading D.had fewer problems with listening 3.We may infer from the last lwo paragraphs that           . A.different teaching methods should be used B.grammar-hased teaching seems to be encouraging C.English courses are necessary for foreign students D.teaching content should be changed halfway 4.The word“it” underlined in the last paragraph refers to“           ”. A.re-think B.activity C.molivation D.timetable