问题 单项选择题

经人类染色体组型分析发现,有2%—4%的精神病患者的性染色体组成为XYY。诸多案例显示XYY综合症患者有反社会行为和暴力倾向,有人称多出的Y染色体为“犯罪染色体”。下列关于XYY综合症的叙述正确的是()

A.患者为男性,可能是由父方减数第二次分裂异常所致

B.患者为男性,可能是由母方减数第一次分裂异常所致

C.患者为女性,可能是由母方减数第二次分裂异常所致

D.患者为女性,可能是由父方减数第二次分裂异常所致

答案

参考答案:A

解析:试题分析:根据题意分析可知:XYY型染色体是由含X的卵细胞和含YY的异常精子结合成的受精卵发育而来的。因含Y染色体,所以患者为男性;可能是由父方减数第二次分裂异常所致。故选A。

听力题

单词(共20小题;每题0.5分,满分10分)

小题1:The children are doing well a____________ (学业上).

小题2:Her abilities are not fully a____________ (欣赏) by her employer.

小题3:They brought back a few s____________ (纪念品) from their holiday in Greece.

小题4:Her husband’s death left a v____________ (真空) in her life.

小题5:Kids e____________ (精疲力竭) themselves by running wildly around the park.

小题6:Crowds poured into the Beijing Worker’s S____________ (体育场) to watch the performance.

小题7:She knew she hadn’t done enough r____________ (复习) for tomorrow’s exam.

小题8: With winter a____________ (临近), many animals are storing food.

小题9: I didn’t want to ask her a lot of e____________ (尴尬的) questions in front of her friends.

小题10:The singer got an e____________ (热情的) reception at the airport.

小题11:She’s a very i____________ (印象深刻的) public speaker.

小题12: “Artificial I____________ (智能)” is a famous science fiction directed by Steven Spielberg.

小题13: Many modern arts are being displayed in that art g____________ (美术馆).

小题14: A lot of small companies have to fight for s____________ (生存).

小题15:The captain gave the order to a____________ (遗弃) the ship since it was sinking fast.

小题16:The hotel room had a g__________ (美丽的) view over the lake.

小题17:He first went to France as an e__________ (交换) student from Beijing.

小题18:The baby was f_________ (害怕) of being left by itself in the house.

小题19: In general, the bride’s father gave her away at the wedding c____________ (仪式).

小题20: Is there a good restaurant in the n____________ (周围)?

单项选择题