题目内容
已知NH3的kb=1.8×10-5，则NH4+的ka是()。
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听力原文：Following last Monday's heavy storm in the Wilmington Valley, flood waters from the Wilmington River have risen over twenty feet. Thousands of families have been evacuated from the region and are living with relatives and in shelters throughout the state. Fortunately, no loss of life has been reported, but property damage is estimated to be in the millions. The downtown districts of both Riverside and Wilmington Falls are completely flooded, and the areas have been closed to all visitors. It is doubtful whether the evacuees will be able to return to their homes any time soon. The president will tour the area on Friday. He will speak to the nation about the situation during his regular Saturday address.
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How many years of work experience？ does Bert Roberts have？
A．advantageB．concernC．benefitD．importance
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California-based company seeking to expand its sales overseas is looking for sales professionals to cover territory in the Pacific Rim region. Successful candidates will have a minimum of two years experience in sales, preferably in the clothing industry, as well as a good professional appearance, excellent communication skills, and a college degree. Conversational knowledge of Japanese or Mandarin Chinese and experience traveling or working in Asia are desirable. Job is based in San Francisco but requires one to two weeks a month of travel. We offer an excellent salary and benefits package including health and life insurance, relocation allowance, and professional development opportunities. Send résumé and two letters of reference to: J. M. Schmidt, 150 State Street, San Francisco, CA 94181. Closing date: June 15.
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