题干

“螳螂捕蝉,黄雀在后”描述的是(  )

A:捕食

B:合作

C:竞争

D:食物网

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答案(点此获取答案解析)

A

同类题1

阅读资料回答下列问题.

2013年初春,流感家族中的一位不速之客﹣﹣H7N9不期而至,拨动着中国内地民众的神经.H7N9型禽流感是一种新型禽流感,3月底在上海和安徽两地率先发现.H7N9禽流感病毒是全球首次发现的新亚型流感病毒,被该病毒感染均在早期出现发热等症状.截至2013年5月16日16时,全国已确诊130人,36人死亡,72人痊愈.迄今为止,没有迹象表明H7N9病毒已发生人际间传播,目前没有疫苗.据国家疾控中心网站介绍,勤洗手、室内勤通风换气、注意营养、保持良好的体质,有利于预防流感等传染病,特别注意尽量避免直接接触病死禽、畜。

(1)H7N9病毒从传染病角度分析属于该病的____ (填“病原体”或“传播途径”),病毒没有____ 结构。

(2)从预防传染病措施看,勤洗手、室内通风换气,这属于____ (填“控制传染源”或“切断传播途径”);对临床诊断为H7N9型禽流感患者进行隔离治疗,这属于____ (填“控制传染源”或“切断传播途径”)。

(3)若H7N9型禽流感疫苗研发成功,注射的疫苗从免疫学角度分析属____ (填“抗原”或“抗体”),它可以提高人体免疫力,这种免疫类型属于____ (填“特异性免疫”或“非特异性免疫”)。

(4)为防治H7N9型禽流感,某些同学自己购买了板蓝根冲剂,其包装袋上印有“OTC”字样,这种药属于____ (填“处方”或“非处方”)药。

同类题5

阅读理解

    We often think that our affairs, great or small, must be tended continuously and in detail, or our world will break apart, and we will lose our places in the universe. That is not true, or if it is true, then our situations were so temporary that they would have collapsed (崩溃} anyway.

    Once a year or so get away for a day. On the eve of my day of absence, I inform housemates, my family and close friends that I will not be reachable for twenty-four hours; then I disconnect the telephone. I sat for at least an hour in a very hot bathtub; then I lay out my clothes in preparation for my morning escape, and knowing that nothing will disturb me, I sleep well.

    On the morning I wake naturally, for I will have set no clock, nor informed my body timepiece when it should alarm. I dress in comfortable shoes and casual clothes and leave my house going no place. If I am living in a city, I wander streets, window-shop, or stare at buildings. I enter and leave public parks, libraries, and theatres. I stay in no place for very long.

    Every person needs to take one day away. A day in which one consciously, separates the past from the future. Jobs, family and friends can exist one day without any one of us. Each person deserves the day in which no problems are faced up to, no solutions searched for, We need hours of aimless wandering or sitting on park benches, observing the mysterious world of ants.

    If we step away for a time, we are not as many may think, being irresponsible, but rather we are preparing ourselves to more ably perform our duties. When I return home, Jam always surprised to find some questions I sought to evade had been answered and some entanglements (瓜葛) I had hoped to flee had become separated out in my absence. A day away can help drive away the bitterness, transform hesitation, and renew the spirit.