问题 单项选择题

紫外线能够杀菌的主要原因是()。

A.破坏细菌的核酸

B.破坏细菌的糖类

C.破坏细菌的脂类

D.破坏细菌的细胞壁

答案

参考答案:A

解析:

被细菌吸收的紫外线能够作用于细胞的遗传物质即DNA(脱氧核糖核酸),它起到一种光化作用,紫外光子的能量被DNA中的碱基对吸收,引起遗传物质发生变异,使细菌当即死亡或不能繁殖后代,达到杀菌的目的。故选A项。

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Education and Training

Make sure your skills are up-to-date

If you’re looking for a new job or you want to change your career, having up-to-date skills is the key to a successful job search and your future earning power.

Choose the right training

If you need training to learn new skills or enhance(提高)existing skills, make sure you got to know the following : What training program is the best for you? How will you pay for your training? You need to consider all these and more when you choose your training.

Search for training providers

Massachusetts school information is made available by the Massachusetts career information system (CIS). This directory includes most of the training providers and colleges in the states. The data for trade schools covers programs, admissions, schedules and costs. Descriptions for two-year, four-year, and graduate schools include information about school size, setting, programs, admissions, schedules, and costs. A link to the school’s Internet home page is provided when available.

Learn about the Entrepreneurial(创业者的)training program

The Entrepreneurial training program (ETP) provides training and technical assistance to individuals with good business ideas and the desire to start their own business.

Learn about Apprenticeship(见习)programs

Division of apprentice training is a system for teaching highly technical skills through a combination of on-the-job training and related classroom instruction. Also, it is responsible for promoting, developing and providing services for apprenticeship programs in the state.

Many apprentice programs are in traditional building trade areas such as Carpentry, Electrical and Ironwork. In addition, apprentice programs are being developed in areas such as Information Technology, Banking and Finance, Childcare, Culinary Arts and Telecommunications.

Use Online Resources

Link directly to the websites of colleges and universities in the state of Massachusetts. Explore other online job databases.

小题1:In order to gain new skills, you need to_____.

A.look for a new job

B.turn to a training provider

C.choose the right training

D.start your own business小题2:According to the text, the CIS_____.

A.designs schedules for training providers

B.organizes schools to do training

C.raises business ideas for training providers

D.provides information of training providers小题3: If you want to start your own company, you probably would turn to_____.

A.an apprentice programs

B.the CIS

C.the Internet

D.the ETP小题4: Which of the following can be inferred from the text?

A.Nobody but the unemployed will show interest in the information.

B.The CIS offers information about schools in Massachusetts.

C.Having up-to-date skills is necessary for starting one’s own business

D.Job hunters prefer online databases to other resources.小题5: Which of the following statements is true?

A.If I want to find information about a four-year school, I should consult ETP.

B.CIS helps to train job seekers.

C.Apprentice programs provide training in areas like Carpentry, Electrical and Iron work.

D.On-the-job training is compulsory for those who want to start their own business.

问答题 简答题