For most purposes, newspaper advertisements are the primary【C1】______ of job information.

Indeed, even if you are not actively seeking a job, the help-wanted section is a good place to learn what kinds of employment opportunities are【C2】______ , what kinds of qualifications are required for specific positions, and what salaries are being offered. 【C3】______dont be misled by the working of the ads. For example, an ad that states the salary as "to $ 750" is only indicating the【C4】______ salary for the job.【C5】______ investigation, you may find that the starting salary is actually only $ 350.【C6】______ , learn to understand the language that advertisers use.【C7】______ , the term "Skis req" in an ad for a secretarial position usually means that the applicant will be expected to【C8】______ the necessary typing, shorthand, filing, and communication skills. If you do not have these【C9】______ , it probably is not worth either your or the advertisers time to answer the ad. You should also learn to distinguish between those ads that are【C10】______ offering employment and those that are really trying to sell you training.

【C1】

A．origin

B．source

C．storage

D．presence