题干

与青蛙相比,雏鸟发育成成鸟的成活率高,其主要原因包括(   )

①体内受精②卵内营养物质丰富③体外受精④卵外有卵壳保护⑤亲鸟有孵卵、育雏行为⑥胎生.

A:①④⑤

B:①④⑤⑥

C:②③

D:①②④⑤

上一题 下一题 0.0难度 选择题 更新时间:2018-11-02 09:31:19

答案(点此获取答案解析)

D

同类题1

阅读文段,回答1-4题。

陪着母亲坐火车

陆总的母亲想回乡下老家过年,他让秘书去买两张飞机票,可母亲却说这辈子从没坐过火车,想坐一次火车。

正逢春运,秘书费了好大的劲,才买来两张硬座票。陆总担心母亲的身体吃不消,劝母亲还是乘飞机回去,可母亲却执意要陆总陪她一起坐火车。一向孝顺的陆总只得依了母亲。

陆总扶着母亲来到火车站,广场上黑压压的人群,让他有些茫然,他不知道该往哪边走。正不知所措的时候,一个中年男子操着家乡话,一边喊:“让开,让开!”一边使劲儿地往前挤。

母亲对陆总一笑说:“跟上他,错不了,一听那口音,就知道是咱武陵人。”

娘俩跟着中年男人很快找到了要乘坐的那趟火车,很巧的是,那人正好坐在他们的对面。

车厢里闹哄哄的,充斥着各种难闻的味道。陆总觉得憋闷,站起来想去透透气,可过道里站满了人,挪个步都很困难,更别说要挤出去了。

中年男子看出陆总的不适,就说:“兄弟,没坐过火车吧,要是感觉不舒服,就多看看窗外的风景吧。”

陆总点点头,只得把注意力集中在窗外。他一边欣赏着窗外的风景,一边听母亲和那个中年男子拉家常。从他们的交谈中,陆总知道那个中年男子也是回家过年的,为了省路费,妻子没回去,就自己一个人回家看看父母。

母亲说:“是该回去看看,一年到头,家里的老人就盼着过年的时候,能见一见自己的孩子。”

 “谁说不是呢?我们出去打工挣钱,为的也是让父母孩子生活得好一些,可是……”男人的话还没说完,一阵卖盒饭的叫卖声由远而近。

陆总买了两份盒饭,他问中年男人:“你要不要来一份?”

男人摇摇头说:“不了,我不饿!”

吃过饭,天也渐渐的暗下来了,陆总有了些困意,靠在母亲的肩头沉沉地睡去。不知道过了多久,他听到一阵窸窸窣窣的声音,朦胧中,他看到一只手伸进了母亲放在桌上的零食口袋。

他正想制止,佯装睡觉的母亲轻轻拐了他一下,示意他别出声,他知道了母亲的用意,也就微闭了双眼。

那个男人似乎饿极了,又怕惊醒了他们,悄悄拿起面包,将头埋在桌下,狼吞虎咽地吃起来。男人很快吃完面包,抬起头,看所有的人都在睡觉,并没有注意到他的举动,也就安心地闭上了眼睛。

一大早,陆总就听到那个中年男人对母亲说:“大婶,对不起,昨晚实在太饿了,我偷吃了你的面包!”

母亲说:“吃就吃了吧,看你是一天一夜都没吃东西了,肯定饿坏了,出门在外不容易,可别亏了自己啊。”

男人长叹一声,说:“大婶,我也不瞒你。这次回家,连路费都是借的,也没多余的钱买吃的了。辛辛苦苦干了一年,临到放假,老板却没了踪影,一分钱都没拿到。俗话说‘儿行千里母担忧’,要是过年都不回去,家中父母又得担心一年了,作为子女那就太不孝了,所以再没钱也得赶回去。”

男人的话引来车厢里很多人的共鸣,大家纷纷谴责那些无良的老板,都说回一趟家,这么辛苦是为了什么?还不是回家尽尽孝,看看自己的爹娘啊!

列车快到站了,那个中年男人的手机响了起来。他接起电话说:“妈,我快下车了,你们放心吧,我一路好得很,有吃有喝的。我买的是卧铺票,休息得好,累不着,你们别担心……”

男人的话听得陆总的双眼涩涩的,下车的时候,他掏出五百元钱递给中年男人,说:“大哥,拿去给父母买点东西吧。”

男人一再推辞不要,陆总的母亲说:“拿着吧,你这样空着手回去,会让父母担心的。你不想让他们知道你过得不好吧。”

男人千恩万谢的拿着钱走了。陆总掏出手机给公司打电话,他说:“你们赶快把拖欠那些工人的工钱全部结清了吧。另外要回家过年的,再给五百元红包,让他们拿回家孝敬父母。”

母亲在一旁听着儿子的电话,欣慰地笑了。她知道,这趟火车没有白坐,自己的良苦用心,终于让儿子找回了诚信和良知。

    (选自《小说选刊》  作者:张玉兰)

同类题3

完形填空

    Peter and Paul had got permission(允许) from their parents to camp in a field close to their farm. But, being adventurous boys, they know it would be more 1to camp in the forest that lay beyond the river. Excitedly, the boys 2 with their tent and food.

    Carrying their heavy 3, the two brothers walked along the riverbank, hardly noticing the distance or the sun beating down. They were eager to reach their 4 before lunchtime. As they entered the cool, shadowy forest, they began to search for a suitable camping place. Peter wanted to 5 close to the river at the edge of the forest, 6 Paul, who was older, insisted that they camp further away. 7, Peter followed his brother deeper into the 8. “This really is a wonderful setting!” said Paul in excitement. They 9their tent, and settled down to eat the sandwiches they had made, then decided to find their way 10 to the river to catch some fish.

    “Are you sure that this is the right 11?” whispered Peter shakily. “I'm sure we passed that hollow tree just a while ago.” Paul walked12 silently. “Look, there it is again. We're lost, aren't we?” complained Peter. Paul had to admit that he didn't know where they were. 13, they were a long distance from where they were 14 to be. They were not even 15 of where they had set up their camp. They sat in 16for a few minutes until Peter had a bright idea. “Why don't we look for clues(线索) the way trackers 17 in the movies? We weren't careful about how we walked, so I'm sure we would have left18 some broken tree branches and leaves. ”

    Carefully, the boys 19the marks that they had left, until finally they found their campsite. Hurriedly, they packed their belongings and set off 20 the direction of the river.

What would their parents think of their adventure(冒险)?