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(1) A的电子式为________，B的分子式为________。
若用B与O2制成燃料电池，并以稀硫酸溶液为电解质溶液，回答(2)-(5)题：
(2)负极上的电极反应式为_______________________________________。
(3)消耗标准状况下的5.6 L O2时，有__________mol电子发生转移。
(4)开始放电时，正极附近溶液的pH__________(填“增大”、“减小”或“不变”)；
(5)溶液中H+由___________区向__________区移动（填“正极”或“负极”）。 查看习题详情和答案>>
| A．1,1,3,3-四甲基丁烷 | B．2,3,4-三甲基戊烷 |
| C．2,4,4-三甲基戊烷 | D．2,2,4-三甲基戊烷 |
Choose the words or expressions and complete the passage. 选择最恰当的单词或词语, 用A, B, C或D表示, 填入括号内.
Do you know Eskimos? Let me tell you something about their (1) .
The Eskimos live near the North Pole. There are only two seasons there: winter and summer. There is no spring (2) autumn there. The winter nights are long. You can't see the sun for more than two months, even at noon. The summer days are long. For more than two months, the sun never (3) .
The Eskimos have warm clothes. They make their clothes from the skins of animals. From skins they make coats, caps and shoes.
Near the North pole trees can't grow, for it is too cold there. The Eskimos have to make their houses from skins, stones or snow. When they (4) in a storm and can't get back home, they make houses of snow. They (5) these snow houses when the storm is over.
Life is hard for the Eskimos, but they still (6) to live there.
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Choose the words or expressions and complete the passage. 选择最恰当的单词或词语, 用A, B, C或D表示, 填入括号内.
Bob is (1) boy. It is Sunday. One day, he goes (2) with his mother. (3) the shop, Bob sees a model ship. He likes it very much. He wants to buy it. So he asks his mother, “Mum, can I have that sheep?”
His mother says, “Yes, I can buy one for you.” Then his mother asks the assistant (4) her a toy sheep.
“No, mum. I don't want this sheep. I want that sheep.”
“But this is the sheep you (5) for, my boy.”
“No, I want that one, not the one (6) .”
“Now,” his mother says, “I see, you want a ship, not a sheep.”
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Read the passage and choose the proper words to fill in the blanks. 阅读短文, 选择合适的词语, 用A, B, C或D表示, 填入括号内.
Jim Green is an announcer (播音员) for the program. Most of the girls and boys like the program. They (1) ________ like Jim Green. Some of them often make phone calls to him and thank him for his work. There are lots of letters to him every day, too.
Jim Green gets up at 6:00 every morning. He has bread and a glass of milk (2) ________breakfast. He leaves home at 6:30 and (3) ________ his office at 7:15.
The program (4) ________ at 7:30. He plays the new records (唱片) of pop songs and modern music for his listeners. At 8:00 it's time for the news.
Jim finishes work at 10:30. He goes home (5) ________ his car. He reads newspapers and listens to music after supper.
He thinks his life is very interesting.
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