根据短文内容，选择正确答案。
D
    John sent for a doctor because his wife was ill. He called the doctor and made sure they would meet at five. He arrived at the doctor's at twenty to five. He thought. “It s a little bit earlier. I'll wait for a moment. It's good to keep the time. ”
    Then he stopped his car in front of the doctor's. He looked around and saw a noisy square not far from here. He went there and sat down on a chair to enjoy the last light of afternoon sun and make himself quiet. He saw some children playing and some women talking to each other happily.
    Suddenly he heard a girl crying. He came up to her and asked some questions. Then he knew she got lost. John tried to find out her address and took her home. The girl's parents were very thankful.
    Then John hurried to the doctor's. The doctor said angrily when he saw him “You're late. Why did you keep me waiting for 20 minutes?" John said nothing but one word "Sorry!”

如图所示，平行线代表电场线，但未标明方向，一个带正电、电量为10^﹣6 C的微粒在电场中仅受电场力作用，当它从A点运动到B点时动能减少了10^﹣5J，已知A点的电势为﹣10V，则以下判断正确的是（   ）

下列关于野外调查的说法，不正确的是（　　）

假如你是水电专家，仅从河流落差来看，你最想把水电站修建在我国的（     ）

下列化学用语正确的是