题干

使人患病的细菌,一般属于( )

A:异养寄生

B:异养腐生

C:自养

D:以上都不对

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答案(点此获取答案解析)

A

同类题1

阅读下文,回答问题

雪人

肖复兴

    今年冬天,北京下了场大雪。雪一下子堆得老厚,白皑皑的,路上像铺了一层绒绒的地毯,这真是北京城难得见到的美景。那天清早,我看见路旁一家小餐馆前堆起了一个雪人,是在这家餐馆打工的几个外地年轻人冒着严寒堆起来的,他们冻得满脸通红却堆得兴致勃勃。雪人挺漂亮,胡萝卜插成的鼻子,彩纸做成的眼睛,用花花绿绿的挂历叠成的蓓蕾帽,手臂里还夹着一根长长的树枝,枝头上挂着几个彩色的气球和几片彩色布条做成的小旗子……雪人融入了几个外地年轻人尽情的想像,是冬天和他们彼此赠予的最好的礼物了。那时,天上的雪花正在飘飘洒洒,街头一片冰清玉洁,宛若童话的世界。那个漂亮的雪人仿佛活了一样,在这飘飞的雪花中轻盈地舞动……

    这个漂亮的雪人引来了不少过往行人的注目——它确实堆得挺别致可爱的。有的人还跳下自行车跑过来看看它,开心地一笑。特别是孩子们,围着它打雪仗,笑声随着雪花飞扬,溅得四处都是。在雪小些的时候,许多家长回家拿来照相机,领着孩子和这个漂亮的雪人合影留念。这个在纷纷扬扬的大雪中诞生的雪人,给这条街增添了不少的欢乐。

    雪停之后,因为气温依然出奇地冷,雪许多天不化。缺少了雪花的陪伴,这个漂亮的雪人显得有些寂寞。人们渐渐失去开始见到它时的兴致,走过它的身边,连看都不看它一眼,它便显得越发孤零零。因为缺乏飘落的雪花的装点,又因为来来往往汽车排放的废气和附近工厂烟囱冒出的烟尘的污染,仅仅几天,雪人就变得灰蒙蒙、黑黢黢的了,仿佛是一个受冷遇又受气的灰姑娘了。

    接着,没过两天,雪人手臂中夹着的枝条上的气球破了,彩色布条做成的小旗被人随手扯下来扔在一旁;然后,雪人的胡萝卜鼻子被拔下来狠狠地插在肚子上,漂亮的蓓蕾帽被撕成碎片撒满一地;雪人已经无可奈何地残疾,但还有人不放过它,路过它的身旁的时候,狠狠地朝它的身上踩几脚,雪块坍塌下来,雪人的头、胳膊……随着就掉落在地上。雪人再不是雪人,成了一堆脏兮兮的垃圾了。

    一个漂亮可爱的雪人,就这样在人们的手中被创造、被破坏了。

    让我多少感到痛心的是破坏它的人大多是可爱的孩子。我亲眼看见好几个孩子路过它的身旁,毫无缘由地踩它,把它当成靶子,拿雪块、石头砸它。而这些孩子里有不少恰恰在前几天还围绕在它身旁,欢乐地打雪仗,或者脸上绽开酒窝和它合影留念。

    我更无法理解的是参与破坏的还有当初创造它的人们。小餐馆里的那几个外地年轻人出来倒脏水就那样毫无顾忌地倒在雪人身上,尤其当雪人坍塌,剩下的半拉身子更成为他们倒脏水倒污物的垃圾桶了。

    看来,雪人最好的命运,是在雪天里诞生,然后立刻消融在雪后的阳光下,消融得没有一点影子。这样,它只会看见我们人类欢乐的前一半,不会看我们随心所欲破坏的后一半。

(选自《无缘无故的恨》,有删改)

同类题5

完形填空,阅读下面短文,然后从各题所给的四个选项中选出一个最佳答案。

    Once there lived two brothers. The elder was called Simon and the younger Victor. They1each other very much, and always took care of one another. Every day they worked from morning2night, getting as much grain(谷物) as possible from their fields.

    One late autumn evening, after their work in the3was done, Simon said to his wife, "Victor got married last month. He has many bills(账单) to pay. I think I will put a bag of rice in his barn(谷仓). “Oh, that's a good idea,” said his wife. “But please don't tell him,” said Simon, “If he knows I put the rice there, he will4take it.”

    So, late that night Simon took a bag of rice to Victor's barn. The next day, while looking at his own barn, he found5strange. “I took a bag of rice to Victor's house last night,6I still have the same number of bags in my barn.7did that happen?”

    Simon decided to take another bag of rice to his brother's barn that night. But the next morning, he found the8number of bags in his barn again! “This is very strange,” he thought. That night he9again. He carried a large bag of rice on his shoulder(肩膀); and walked down the road to his younger brother's house. In the bright moonlight, he could see another10coming down the road. He was carrying something on his11, too. “Younger Brother!” Simon cried, “What are you doing?” “I was 12you, Older Brother,” said Victor, “Your family is13than mine. I thought you needed more rice.” The two brothers quickly14that they had been taking rice to each other. They15what had happened. “It is good to have a brother like you,” they both said. And they lived happily ever after.