题干

研究人员最近发现了一种“水”电池,这种电池能利用淡水与海水之间含盐量差别进行发电,在海水中电池总反应可表示为:5MnO2+2Ag+2NaCl=Na2Mn5O10+2AgCl,下列“水” 电池在海水中放电时的有关说法正确的是(   )

A:正极反应式:Ag+Cl-e=AgCl

B:每生成1 mol Na2Mn5O10转移2 mol电子

C:Na不断向“水”电池的负极移动

D:AgCl是还原产物

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答案(点此获取答案解析)

B

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    Joe Azougar was walking his dog when a bear appeared suddenly.

   "When it came up, the first thing my dog did was1  me and attack the bear, " Azougar said from his 2 in Lady Minto Hospital.

    Then Azougar ran into his house and began to3  his neighbors, warning them what was going on."As I looked around I saw the bear pull my dog into the 4. And to my great sadness, the dog waskilled," he said.

    Then suddenly, the bear 5 and it broke through the house's back window. Azougar began throwing things at the bear and making loud noises. Then he stoodon a chair to make himself look much 6.

    "It seemed as if the bear was very 7 ,  said Azougar.“I thought my best chance was to run outside  8 someone could find me."

    Azougar began running,but the bear  9  him.

    "It had four paws on top of me," he said.“Then, it  10  my body and tried to bite my stomach. That gave me just a few 11  to turn into and protect my head."

    The bear began to pull Azougar's body. “By that time I could feel my body becoming  12," Azougar said.

    Luckily, two women, who were13 , saved him. Their car was such a(n) 14  thing in the bear's eyes, that it ran quickly into the woods.

    "I am just thankful to those two angels that saved me in time," he said.

    People, who have lived here for 20 or 30 years, said they had  15 seenanything like this," said Azougar. He is the first one, and he hopes that he will be also the last one. "Now I'm planning to move somewhere else once I come out of hospital."