用你所学的生物学知识来判断，下列说法正确的是（ ）
A．绿色植物的光合作用只能在叶片中进行
B．肺泡与血液的气体交换后，血液中的二氧化碳全部进入肺泡
C．生态系统中的物质和能量是沿着食物链和食物网流动的
D．自然界中的细菌都是单细胞生物，真菌都是多细胞的生物
A、叶片具有叶绿素，是进行光合作用的主要器官，而不是绿色植物的光合作用只能在叶片中进行，不符合题意．
B、肺泡与血液的气体交换后，只有部分二氧化碳由血液扩散到肺泡里，因为气体总是由浓度高的地方向浓度低的地方扩散，直到平衡为止，所以是部分二氧化碳由血液扩散到肺泡里而不是全部，不符合题意．
C、生态系统中的物质和能量是沿着食物链和食物网流动的，如食物链：草→兔→鹰，兔吃草，草进行光合作用储存的物质和能量就进入了兔的体内，鹰吃兔，兔体内储存的物质和能量就到了鹰的体内．符合题意．
D、真菌有单细胞的，如酵母菌；也有多细胞的，如霉菌等，细菌是没有细胞结构的单细胞生物，不符合题意．
故选：C
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| Louise was 72 years old and she lived by herself. The first thing she noticed when she came downstairs that Sunday morning was that her 1 window was open. In fact, it was so wide open that she had 2 closing it. Then she realized that things were not in their proper 3 . Finally, when she found her empty 4 on the kitchen table,she realized the awful 5 . At first, she didn't know what to do. Then she decided to 6 her son, Derek. Derek's wife Sybil answered the phone, "It's your mother," she 7 him coldly. Louise told Derek about the open window, about things being in the wrong places and about the 8 missing from her purse. "All right," said Derek, "Don't 9 anything. I'll be 10 in half an hour." Louise 11 and made herself a pot of tea and some toast. Then she went from room to room wondering 12 anything else was missing. When Derek arrived, he was content to 13 her looking so calm. "Have you rung the 14 ?" he asked. "No? Then I'll do that straight away." So he rang the police. As it was Sunday, 15 the only detectives were out.However, the police were polite, but vague (含糊的). "We'll send 16 round as soon as possible," they said. Derek telephoned his wife. "I'm not sure when I'll be home, love." he told her, "I've got to 17 for the police." While Derek and his mother waited, Derek 18 the catches (挂钩) on the windows and locks on the doors. All of them were old and some of the catches hardly 19 at all.Derek felt 20 . His mother was an old woman, after all. "I'll have to change all these," he told her. | ||||
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