问题 选择题

今年央视3·15特别行动节目抛出一枚食品安全重弹,曝光了在食品生产中使用“瘦肉精”的猪肉,这次检测到的瘦肉精主要是盐酸克伦特罗,化学式为C12H18Cl2N2O。下列说法正确的是

A.盐酸克伦特罗是由35个原子构成

B.盐酸克伦特罗的相对分子质量为277 g

C.盐酸克伦特罗中碳、氢、氧元素质量比为12:18:1

D.盐酸克伦特罗属于有机物

答案

答案:D

A、根据标在元素符号右下角的数字表示一个分子中所含原子的个数;可知一个盐酸克伦特罗含有的原子数为:

12+18+2+2+1=35;故A说法错误;

B、根据相对原子质量是有单位的,其单位为“1”,只不过常省略而已;盐酸克伦特罗的相对分子质量为277;故B说法错误;

C、根据盐酸克伦特罗中碳、氢、氧元素原子个数比为12:18:1,故C说法错误;

D、根据含有碳元素的化合物叫有机化合物,简称有机物.碳的氧化物、碳酸盐、碳酸虽含碳,但其性质与无机物类似,因此把它们看作无机物.判断盐酸克伦特罗属于有机物.故D说法正确;

故选D.

单项选择题 A1/A2型题
单项选择题

Regardless of their political affiliation, in all countries women must overcome a host of stumbling blocks that limit their political careers. "Most obstacles to progress consist of (1) of various kinds," says the Inter-Parliamentary Union (IPU), a Geneva-based organization (2) 139 parliaments, including the lack of time, training, information, self-confidence, money, support, motivation, women’s networks and solidarity between women.

In every culture, prejudice and stereotypes (3) hard. The belief still holds (4) that women belong in the kitchen and (5) the children, not at election (6) or in the Speaker’s chair. The media often reinforce traditional images of women, who, upon entering politics, also bear the brunt (正面冲击) of verbal and physical (7) .

In impoverished (贫穷的) countries (8) by civil conflicts and deteriorating economic and social conditions, women are (9) by the tasks of managing everyday life and looking after their families.

The IPU stresses the general lack of child-care facilities—often (10) a privileged few—the (11) of political parties to change the times and running of meetings and the weak backing women receive from their families. That support, which is (12) as well as financial, is (13) vital because women have internalized (14) images of themselves since the (15) of time and often suffer from low self-confidence.

Another obstacle is the lack of financial resources, especially as election campaigns become increasingly expensive. (16) , women encounter more or less open machismo (男子汉的高傲) in the (17) of closed political circles (18) entry to the "second sex. " Lastly, they (19) the lack of solidarity between women, (20) by the fact that the number of available positions is limited.

18()

A.inspiring

B.barring

C.disapproving

D.banning