问题
选择题
小明长时间连续嗑带盐的瓜子后，口腔和唇有一种干涩的感觉，分析原因不正确的是[ ]
A．口腔和唇的黏膜细胞内溶液浓度小于细胞外溶液浓度
B．口腔和唇的黏膜细胞发生渗透失水现象
C．口腔和唇的黏膜细胞发生质壁分离
D．瓜子中的盐使细胞外溶液浓度加大
答案
答案：C
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小明长时间连续嗑带盐的瓜子后，口腔和唇有一种干涩的感觉，分析原因不正确的是[ ]
A．口腔和唇的黏膜细胞内溶液浓度小于细胞外溶液浓度
B．口腔和唇的黏膜细胞发生渗透失水现象
C．口腔和唇的黏膜细胞发生质壁分离
D．瓜子中的盐使细胞外溶液浓度加大
答案：C
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One day, the Greys were walking in the countryside when Belinda, Mr. Grey's daughter, saw a little boy playing happily with a lovely dog in his yard. "How lovely the dog is! I want 1._________ a pet dog, too!" said Belinda to his parents. "But we live in the building. People who live in buildings 2._________ to keep pets," said Mrs. Grey. Belinda felt disappointed and cried 3.________. Suddenly, Mr. grey had an idea. He took Belinda to a toy shop. He went in and soon went out with a big box ." What's in the box ?" Little Belinda thought .After arriving home ,Belinda opened the box and found an electric dog .It could walk, bark and wag its tail like a real dog ! Belinda enjoyed 4._________ with it very much. Many things are not so nice as we think, but we can do something instead. It will still make 5._________ happy. |