题目

下列关于草履虫的叙述中，错误的是A. 草履虫是一种单细胞动物B. 依靠纤毛运动C. 有神经系统，能对外界刺激作出反应D. 食物在食物泡内消化吸收 答案：【答案】C【解析】草履虫属于单细胞生物，单细胞生物的身体只由一个细胞构成，但能够像多细胞生物体一样，进行运动、呼吸、消化、生殖等多项生命活动。常见的单细胞生物有酵母菌、草履虫、衣藻、眼虫、变形虫等，A正确；草履虫身体表面包着一层膜，膜上密密地长着许多纤毛，靠纤毛的划动阅读理解. Sleeping Questions of Chinese Students 　　Experts (专家) say that students usually need eight to ten hours' sleep at night, but most Chinese students do not get enough sleep. Some Chinese parents are usually glad to see their children studying late. They will think their children work very hard．But not all parents are happy about this. Once a mother told us that every morning her l0-year-old boy put up one finger with his eyes still closed, begging(乞求) for one more minute to sleep. Like thousands of student "Early birds" in China, he has to get up before six every morning. 　　A report (报道) shows that if they don't have a good night's sleep，students seem to be weaker than they should be．Many students have fallen asleep during class at one time or another．Too much homework is not the only reason(原因)why students stay up late．Some watch TV or play the computer games late into the night． 　　Experts ever say that students should develop(养成)good study habits．So some clever students never study late，they are able to work well in class． 根据短文内容，选择正确答案. （1）The 10-year-old boy begs for one more minute to sleep because ______. [　　] A．he doesn't have enough sleep B．it isn't time for him to get up C．he doesn't want to go to school D．he wants his mother to wake him up （2）In paragraph 1 the underlined phrase "Early birds" means persons who ________. [　　] A．get up early B．get up late C．sleep less D．don't want to sleep （3）From the passage we know if students don't get enough sleep，they may_____． [　　] A．become too weak to sleep B．not work well in class C．go to bed early D．be weak in English （4）The underlined phrase "stay up late" in paragraph 2 means"________"． [　　] A．study late B．watch TV late C．not go to bed until late D．stay outside （5）From the passage we can know that________． [　　] A．if you want to study better， you must work hard B．sleeping less means working hard C．some clever students are able to work well in class because they have good study habits D．students don't have enough sleep only because they have a lot of homework to do