1.判断题- (共1题)
2.单选题- (共87题)
A.雄蛙和雌蛙的抱对有利于提高卵的受精率 |
B.雄蛙的鸣叫是一种求偶行为 |
C.青蛙既能生活在水中,又能生活在陆地上,所以它是两栖动物 |
D.青蛙的受精卵是在水中孵化的,所以水温及水质状况会影响受精卵的孵化率 |
A.用嫁接或扦插的方法繁殖可保持果树的优良性状 |
B.蝗虫的生殖和发育特点表现为体内受精,不完全变态发育 |
C.两栖类动物进行体外受精和变态发育 |
D.鸟类生殖和发育的特点是体内受精,体外发育 |
A.青蛙抱对后,在雌蛙体内完成受精作用 |
B.输卵管是人体胚胎发育的场所 |
C.已受精的鸡卵中,卵黄将来发育成雏鸡 |
D.鸟卵外有卵壳,具有保护作用 |
A.不同生物的染色体不同,但DNA分子相同 |
B.DNA分子是染色体的主要组成成分 |
C.染色体和DNA分子都是遗传物质 |
D.染色体的组成包括DNA分子和基因 |
A.改变了高粱种子的营养成分 |
B.使高粱里的一些遗传物质发生了变化 |
C.直接改变了高粱的某些性状 |
D.淘汰了高粱的某些不良性状 |
A.变异对生物是有害的 |
B.变异对生物是有利的 |
C.变异是定向的 |
D.变异的有利和有害是相对的,它取决于生物的生存环境 |

A.图中①是蛋白质分子,②是DNA分子 |
B.DNA是链状结构,外形很像一个螺旋形的梯子 |
C.一条染色体应该含有2个DNA分子 |
D.每条染色体上有很多蛋白质,蛋白质不能控制生物性状 |
A.生物的遗传现象是普遍存在的,而变异现象则不是普遍存在的 |
B.子女的性状一定和父母相同 |
C.“种瓜得瓜,种豆得豆”“一母生九子,九子各不同”是对遗传和变异现象的生动描述 |
D.生物的变异现象是普遍存在的,而遗传现象则不是普遍存在的 |
A.近亲结婚会引发家庭矛盾 |
B.近亲结婚违背社会道德 |
C.近亲结婚后代一定会患遗传病 |
D.近亲结婚后代患遗传病的机会大 |
A.0 | B.25% | C.75% | D.100% |
A.AA, aa | B.Aa, aa | C.AA, Aa, aa | D.aa |
A.23对,23条,46对,46条![]() | B.23条,23条,46对,46对 |
C.23条,23条,23对,23对![]() | D.23对,23对,46条,46条 |
A.一半来自父方、一半来自母方 |
B.一半以上来自父方,一半以下来自母方 |
C.一半以下来自父方、一半以上来自母方 |
D.与父亲相似的人,来自父方多,与母亲相似的人,来自母方多 |
A.改变这些植物的某些性状 |
B.改变这些植物的营养成分 |
C.淘汰这些植物的某些不良性状 |
D.诱导这些植物种子的遗传物质发生改变 |
A.普通甜椒的种子经过太空漫游后,培育出大而甜的“太空椒” |
B.高产易倒伏小麦与低产抗倒伏小麦杂交培育出高产抗倒伏小麦 |
C.在毛色均表现正常的虎群中,出生了一只白色的幼虎 |
D.干旱环境中异常矮小的玉米植株 |
3.选择题- (共19题)
A woman repeated a bit of gossip (流言) about a neighbour. Within a few days the whole neighbourhood knew the story. The neighbour was deeply hurt. Later the woman responsible (负责) for spreading the gossip learned that it was completely untrue. She was very sorry and went to a wise old man to find out what she could do to repair the harm.
“Go to the marketplace,” he said. “and buy a chicken, and have it killed, then on your way home, pluck (拔) its feathers and drop them one by one along the road. ” Although surprised by this advice, the woman did what she was told.
The next day the wise man said, “ Now, go and collect all those feathers you dropped yesterday and bring them back to me. ”
The woman followed the same road, but she was so discouraged when she found the wind had blown all the feathers away. After searching for hours, she returned with only three in her hand.
“ You see, ” said the old man, “it's easy to drop them, but it's impossible to get them back . So it is with gossip. It doesn't take much to spread a gossip, but once you do, you can never completely undo the wrong.”

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【1】题量占比
判断题:(1道)
单选题:(87道)
选择题:(19道)
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【2】:难度分析
1星难题:0
2星难题:0
3星难题:0
4星难题:1
5星难题:0
6星难题:44
7星难题:0
8星难题:37
9星难题:6