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已知E$(Cu2+|Cu+)=0.153 V，E$(Cu+|Cu)=0.521 V，则E$(Cu2+|Cu)=

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为求AgCl的活度积，应设计电池为

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Directions: Now you will hear a news report. At the end of the report, you will hear some questions. After you hear a question, choose the best answer from the four choices. 1. A) Many department stores in the US are in trouble.B) Many department stores have better services now.C) Many department stores have attracted old people.D) Many department stores no longer display luxuries.2. A) Customers don’t have time to go shopping.B) Online shopping only attracts young people.C) Customers spend more time shopping online.D) Customers don’t have money to buy luxuries.3. A) Help customers to save more money.B) Find more interesting styles of clothes.C) Provide a better environment and service.D) Let customers receive their items at home.

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