问题 单项选择题

生物种类的灭绝是一个依赖于生态地理和生理变量变化的过程。这些变量以不同的方式影响不同种类的有机体,因而灭绝的方式应该是杂乱无章的。然而化石记录显示生物以一种令人惊奇的确定方式灭绝,很多种群同时消失。 以下哪一项如果正确,为对于化石记录所显示的灭绝方式提供至少一个部分的解释形成了最好的基础( )

A.主要的灭绝发生期是由于影响很多不同种群的范围很广的环境变化引起的

B.某些灭绝发生期有选择性地影响那些拥有它们种群独一无二特征的有机体

C.一些种群灭绝了是因为它们的当地环境逐渐积累的变化

D.在地理上的最近一段时间,没有什么化石记录,人满为患的干预已经改变了灭绝的方式

答案

参考答案:A

解析: 题干的论证过程是:由于生物种类的灭绝是因为生态地理和生理变量变化的结果,而这些变量是以不同的方式影响不同的种类,所以灭绝时间不应一致,但化石显示很多种群同时灭绝,对此最合理的解释就是其他原因导致它们同时灭绝,故答案为A。

单项选择题 A1型题
阅读理解

A few years ago, when I was still in high school, I met a wonderful and warm teacher. At that time in my life, there were many changes to adjust to, apart from the usual teenage troubles. My parents had divorced, so my elder brother and I had chosen to stay with my dad. Due to the fact that he was keeping the house, we didn’t have to move.

During this time, my teacher took a special interest in me. Being my English teacher, she encouraged my mind to travel to creativity I had long given up. She brought me out of the shell I built.

She became my mother, my older sister, my friend and my teacher. The one thing she couldn’t do though was to make me more girly as growing up with only my dad and brother made me a real tomboy.

Sometimes, I would be really immature(不成熟的), especially if she was scoring me less than others on purpose. She knew I could do better than what I was handing in and so pushed me to extend further than limits.

When I finished school and then after college I was about to leave my hometowns she gifted me a watch that every second, with my pulse, should remind me of the one person who will forever wait and love me without reservation.

Time has passed and our friendship is distant, but in my heart, soul and mind, she is the closest I ever got.

小题1:The writer and her elder brother chose to live with their father simply because _________.

A.their mother was expecting to have another baby

B.they didn’t have to move out of their house

C.they hated their mother remarried

D.they had a closer relationship with their father小题2:How did the writer get along with her studies before she met her English teacher?

A.She was hopeless and had given up her studies.

B.She was getting along well with her studies.

C.She had some trouble with her studies.

D.She lacked interest in creativity.小题3:The writer behaved herself like a boy because ________.

A.she needed the love of mother

B.she wanted to learn from her father and brother

C.she lived with only men all the time

D.her English teacher didn’t care about her小题4: What was the writer’s attitude to the watch given by the teacher?

A.She considered it to be very useful.

B.She valued it very much.

C.She kept it very well.

D.She wanted to do something later in return for it.