在糖异生中有（）个重要的酶起关键作用，它们是（）酶、（）酶、（）酶、（）酶。

各组物质的分类正确的是(　　)

①混合物:水玻璃、水银、水煤气

②电解质:明矾、冰醋酸

③酸性氧化物:CO₂、CO、SO₃

④同位素:¹H、²H₂、³H

⑤同素异形体:C₆₀、金刚石、石墨

⑥干冰、液氯都是非电解质

A．①②③④⑤⑥

B．仅②④⑤⑥

C．仅②⑤⑥

D．仅②⑤

阅读理解。

     Important change took place in the lives of women in the 19th century. When men went out from

their farms to cities to seek jobs in industry, peasant women had to take over the sowing, growing, and

harvesting of the fields as well as caring for cattle and raising their children. When women also moved

to the cities in search of work, they found that it was increasingly. Separated by sex and that employment

opportunities for women were limited to the lower-paid jobs. Later in the century, women in industry

gathered mainly in cloth-making factories, though some worked in mining or took similarly difficult and tiring

jobs.

     In the 1800s, service work also absorbed (吸纳) a great number of women who arrived in the cities from

the country. Young women especially took jobs as servants in middle-class and upper-class homes; and as

more and more men were drawn into industry, homestic service (家庭服务) because increasingly a female

job. In the second half of the century, however, chances of other service work also opened up to women,

from sales jobs in shops to teaching and nursing. These jobs came to be done mainly by women and low paid.

     For thousands of years, when almost all work was done on the family farm or in the family firm

(家庭作坊),home and workplace had been the same, In these cases, women could do farm work or hand

work, and perform home duties such as child care and preparation of meals at the same time, Along with the

development of industry, the central workplace, however, such as the factory and the department store,

separated home from work, Faced with the necessity for women to choose between home and workplace,

Western society began to give particular attention to the role of women as homemakers with more energy

than ever before.

1. We learn from the first paragraph that _____ had been done chiefly by men before they went to

cities to seek jobs.

A. mining, teaching, and nursing

B. sewing clothes and mining

C. soeing, growing, and harvesting

D. caring for cattle and growing crops

2. Domestic service because a female job mainly because _____.

A. more and more women began to work in domestic service

B. women mainly worked as servants, nurses, and miners

C. service and industrial jobs absorbed more women than men

D. women enjoyed working as sellers, teachers, and miners

3. We know from the passage that in the 1800s _______.

A. more and more women began to work in domestic service

B. women mainly worked as servants,nurses,and miners

C. service and industrial jobs absorbed more women than men

D. women enjoyed working as sellers,teachers,and miners

4. This passage is about _____ in the 19th century.

A. service and industry

B. female and male jobs

C. women and their work

D. female jobs and the pay

青紫型的先天性心脏病有__________和_____________等。

动物的正常细胞在体外培养条件下的生长行为是（）

A、能无限增殖

B、在有充分营养条件下，能无限增殖

C、不能无限增殖，其增殖代数与物种和供体年龄有关

按照我国《担保法》的规定，出质人可以提供办理质押担保的是( )。

A．土地

B．房地产

C．构筑物

D．依法可以转让的股票