问题 阅读理解

The rise of the so-called “boomerang generation” is revealed in official figures showing that almost one in five graduates in their late 20s now live with their parents.

By contrast, only one in eight university graduates had failed to fly the nest by the same age 20 years ago. It also found that grown-up sons are twice as likely as their sisters to still be living with their parents in their late 20s. With nearly a quarter of men approaching 30 still living at home, the findings are bound to lead to claims of a “generation of mummy’s boys”.

Young professionals in their late 20s or early 30s have been nicknamed the “boomerang generation” because of the trend toward returning to the family home having initially left to study. Recent research has suggested that young people in Britain are twice as likely to choose to live with their parents in their late 20s than their counterparts elsewhere in Europe.

Rising property prices, mounting student debts and the effects of recession on the job market have forced a wave of young people to move back into the family home at an age when they would normally be moving out. But commentators warned that the phenomenon may have more to do with young people facing “dire” prospects than simply a desire to save money.

While the proportion of those of university or college age moving out from the family home has continued to rise in the last 20 years, among those in their mid and late 20s the trend has been reversed. Overall 1.7 million people aged from 22 to 29 now share a roof with their parents, including more than 760,000 in their late 20s. In 1988, 22.7 per cent of men aged 25 to 29 were still living with their parents but last year the proportion was 24.5 per cent.

小题1: What is the main idea of the passage?

A.The economic crisis has shown its effect on the young generation.

B.More young professionals are returning home to live.

C.British parents are suffering more loads from their grown-up children.

D.Britain is suffering more than any other country in Europe.小题2: Which of the following statements is TRUE?

A.Male children seem to more independent than females.

B.Eighty percent of university graduates were able to live independently two decades ago.

C.The grown-up children choose to live with their parents only to save money.

D.More and more children are moving out at university age.小题3: What does the underlined word “dire” probably mean?

A.promising.

B.inconvenient.

C.very bad.

D.hopeful小题4: The following factors may account for the phenomenon except _____.

A.that living prices have risen a lot.

B.that it’s difficult to land a job.

C.that education has already cost them a lot

D.that parents can help them more

答案

小题1:B小题1:D小题1:C小题1:D

读图填空题

下 * * 幅图中:图中甲表示动物干细胞进行的一系列生理过程,乙表示哺乳动物乳腺细胞合成并分泌乳腺蛋白过程中生物膜面积变化,丙为流感病毒,请据图回答问题:

(1)甲图中A细胞经过①②过程形成细胞C,C经过③形成细胞D,则③过程表示________,它发生在生物体的整个生命进程中。

(2)科学家提供35S标记的氨基酸培养哺乳动物乳腺细胞,测量细胞合成并分泌乳腺蛋白过程中各种膜结构的面积变化,结果如乙图,其中a、b、c代表膜结构名称。那么,放射性标记在a、b、c中出现的先后顺序为__________。(用字母a、b、c及箭头表示)

(3)若甲图中D细胞分泌的X物质为蛋白质类物质,蛋白质类分泌物除可能是酶外,还可能是_______、__________(至少写出两类可能的分泌物名称)。从物质X排出细胞过程中细胞内各部分生物膜结构和功能的关系分析,可以说明____________。

(4)将该动物干细胞进行动物细胞培养,在培养过程中,利用3H标记的胸腺嘧啶脱氧核苷酸标记某一细胞,在不同间隔时间下进行放射显影,得到下图所示结果。

实验结果注明:

Ⅰ.开始观察,细胞已被标记 Ⅱ.标记细胞开始进入分裂期 Ⅲ.观察到细胞分裂期中期的细胞

Ⅳ.开始观察到两个细胞被标记 Ⅴ.标记细胞进入分裂期 Ⅵ.开始观察到四个细胞被标记

从实验结果分析可知该动物干细胞的细胞周期为____________h。

(5)图丙所示生物常使人及其他生物产生疾病,该类生物与人体细胞在结构上的主要区别是__________。

单项选择题