传染性单核细胞增多症时使用肾上腺皮质激素可明显减轻症状，其应用的适应证是（） A.伴

大中型及限额以上项目的项目建议书，由( )委托具有相应资质的工程咨询单位评估后审批。

A．国务院
B．行业归口主管部门
C．国家发展和改革委员会
D．部门或地方发展和改革委员会

SS7E型电力机车在变压器高压套管内的导电杆上套入整体环氧浇注的（），使整体结构更为紧凑。

在下列各句中的横线处依次填入词语，最恰当的一组是( ) ①这里曾一度______泥石流，致使公路堵塞，桥梁冲垮，交通瘫痪。 ②车尔尼雪夫斯基对托尔斯泰______表现人物心理变化的艺术特色极为称道。

A．暴发 擅长

B．爆发 擅长

C．暴发 善于

D．爆发 善于

Imagine eating everything delicious you want with none of the fat. That would be great, wouldn’t it

New "fake fat" products appeared on store shelves in the United States recently, but not everyone is happy about it. Makers of the products, which contain a compound called olestra, say food manufacturers can now eliminate fat from certain foods. Critics, however, say the new compound can rob the body of essential vitamins and nutrients and also cause unpleasant side effects in some people. So it’s up to consumers to decide whether the new fat-free products taste good enough to keep eating.

Chemists discovered olestra in the late 1960s, when they were searching for a fat that could be digested by infants more easily. Instead of finding the desired fat, the researchers created a fat that can’t be digested at all.

Normally, special chemicals in the intestines (肠道) "grab" molecules of regular fat and break them down so they can be used by the body. A molecule of regular fat is made up of three molecules of substances called fatty acids.

The fatty acids are absorbed by the intestines and bring with them the essential vitamins A, D, E and K. When fat molecules are present in the intestines with any of those vitamins, the vitamins attach to the molecules and are carried into the bloodstream.

Olestra, which is made from six to eight molecules of fatty acids, is too large for the intestines to absorb. It just slides through the intestines without being broken down. Manufacturers say it’s that ability to slide unchanged through the intestines that makes olestra so valuable as a fit substitute. It provides consumers with the taste of regular fat without any bad effects on the body. But critics say olestra can prevent vitamins A, D, E and K from being absorbed. It can also prevent the absorption of carotenoids (类胡萝卜素), compounds that may reduce the risk of cancer, heart disease, etc.

Manufacturers are adding vitamins A, D, E and K as well as carotenoids to their products now. Even so, some nutritionists are still concerned that people might eat unlimited amounts of food made with the fat substitute without worrying about how many calories they are consuming.

What is a possible negative effect of olestra according to some critics（）。

A. It may increase the risk of cancer.

B. It may impair the digestive system.

C. It may spoil the consumers’ appetite.

D. It may affect the overall fat intake.

如何执行我国现有的国家水污染物排放标准体系？