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【单选题】
特许经营的()是指在经济、技术、科学及管理等社会实践中，对重复性事物和概念通过制定、发布和实施标准，达到统一，以获得最佳秩序和社会效益。A.
专业化
B.
标准化
C.
简单化
D.
差异化
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皮皮学刷刷变学霸
举一反三
【简答题】__________是表音文字所没有的一种构形要素，而且各种类型都有各自的形态和书写要求。
【单选题】使得老舍从无名小卒成为名作家的是( )。
A.
《老张的哲学》《赵子曰》《二马》
B.
《骆驼祥子》《月牙儿》
C.
《四世同堂》 、《残雾》
D.
《茶馆》、《龙须沟》
【单选题】What does the man usually de to spend his weekends in summer?
A.
Goes to swimming.
B.
Does some odd jobs.
C.
Sits in the park.
【单选题】Lysosomes contain ______.
A.
hydrolytic enzymes
B.
genetic material
C.
stored fats
D.
proteins
E.
carbohydrates
【多选题】What are the functions of lysosomes?
A.
Many extracellular particles and molecules ingested by cells end up in lysosomes, which are membranous sacs of hydrolytic enzymes that carry out the controlled intracellular digestion of both extracellular materials and worn-out organelles.
B.
They contain about 40 types of hydrolytic enzymes, including those that degrade proteins, nucleic acids, oligosaccharides, and lipids.
C.
All of these enzymes are optimally active in the acidic conditions (pH ~5) maintained within lysosomes.
D.
The membrane of the lysosome normally keeps these destructive enzymes out of the cytosol (whose pH is about 7.2), but the enzymes’ acid dependence protects the contents of the cytosol against damage should some of them escape.
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