Ann was ill. She went to see a doctor. The doctor asked her to1her tongue (舌头), and then he said,  "OK. You can put your tongue back now. There's2wrong with you, but I'm afraid you have a problem, you never do3"

    "But, doctor," Ann said, "I don't think so."

    "Don't4me what you think," the doctor said, "I see a lot of people5you. None of them get any exercise. They sit in offices all day and in front of the TV in the evening. You must walk quickly for at least 20 minutes a day."

    "Doctor, you don't understand," Ann said, "I take enough exercise every day."

    "I don't want to6any excuses," the doctor said, "You must spend time 7 exercise, if you don't, you will get8 and have health problems."

    "But I walk every day." Ann said.

    "Oh, yes, and I know what kind of walking that is. You walk9meters to the bus stop from your house, from the bus stop to your office, and from your office to your dining-room for lunch and back. That's not a real walk. I'm talking about a walk by the lake or in the park for 20 minutes every day."

    "Would you please 10  me, doctor?" Ann said,   "I'm a postwoman. I walk for nearly seven hours every day."

    For a moment the doctor was silent, then he said, "Can I see your tongue again?"

观察下图鸡卵结构，若该卵已受精，则1号结构为 （  ）

如图是钠元素和氯元素在元素周期表中的信息和两种原子的结构示意图，下列有关说法不正确的是（   ）

某校创办了“创客社团”，该社团的同学开展了如下四个探究活动：

小明想了解美国的地理位置，应该查阅下列哪幅地图（　　）