题目

有关“探究培养液中酵母菌数量动态变化”的实验，正确的叙述是（    ） A．改变培养液的pH值不影响K值（环境容纳量）大小 B．用样方法调查玻璃容器中酵母菌数量的变化 C．取适量培养液滴于普通载玻片后对酵母菌准确计数 D  营养条件并非影响酵母菌种群数量变化的唯一因素 答案：D 解析: 养分、空间、温度和有毒排泄物等是影响种群数量持续增长的限制因素pH值变化影响微生物的生长，样方法是调查植物种群密度的方法，对酵母菌计数时先将盖玻片放在计数室上，用吸管吸取培养液，滴于盖玻片边缘，让培养液自行渗入。多余培养液用滤纸吸去。稍待片刻，待细菌细胞全部沉降On a flight from Johannesburg, a middle-aged rich white South African lady had found herself sitting next to a black man. She called the cabin crew attendant over to complain(抱怨) about her seat. “What seems to be the problem, Madam?” asked the attendant. “Can’t you see?” She said, “You have seated me next to a black person! I can’t possibly sit next to this kind of person. Find me another seat!”“Please calm down, Madam,” the stewardess replied. “The flight is very full today, but I will tell you what I will do---- I will go and check to see if we have any seats available(可利用的) in club or first class.”The woman glanced at the angry black man beside her. A few minutes later, the stewardess returned with the good news, which she delivered to the lady. “Madam, unfortunately, as I expected, economy is full. I have spoken to the cabin services director, and club is also full. However, we do have one seat in first class.”Before the lady had a chance to answer, the stewardess continued, “It is most extraordinary to make this kind of upgrade, however, and I have had to get special permission from the captain. But, learning this condition, the captain felt that it was shocking that someone should be forced to sit next to such a tiring person.”Having said that, the stewardess turned to the black man sitting next to the lady, and said, “So if you’d like to get you things, sir, I have your seat ready for you…”At this point, obviously the surrounding passengers stood and gave an applause while the black man walked up to the front of the plane. 小题1:Why did the lady complain about her seating?A．Because she didn’t want to sit in economy.B．Because she would like a seat in first class. C．Because she didn’t want to sit next to a black man. D．Because she didn’t want to sit in club.小题2:What was the good news for the lady?A．The black man would have to change for another seat. B．The captain understood her situation. C．The cabin director was sparing no effort to help her.D．They have one seat in first class.小题3:What was the other passengers’ attitude towards the lady?A．They liked her very much because she was a rich lady. B．They disliked her because she looked down upon the black man. C．They applauded for her when she moved to another seat. D．They disliked her because she was not polite to the stewardess.小题4:What was unexpected to the lady?A．The plane was so full that day. B．They found a seat for her in club. C．The captain himself was concerned about her problem. D．They found another seat for the black man.