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问题 单项选择题

某居住区的居住人数为12万人，居住区占地面积为4公顷，其中居住建筑用地面积为3公顷，其他用地面积为1公顷，则人口净密度为（）。

A．4万人/公顷

B．3万人/公顷

C．1万人/公顷

D．12万人/公顷

答案

参考答案：A

选择题

下表列举了四种生物及其所属的类群、该类群生物的一项共同特征。匹配正确的是（   ）

 生物名称生物类群该类群的一个特点
A蝗 虫昆 虫有两对翅，三对足
B木 耳病 毒没有细胞结构
C青 蛙软体动物皮肤辅助呼吸
D大肠杆菌真 菌细胞内无成形的细胞核
 
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单项选择题

Almost everyone likes dogs, and almost everyone likes to read stories about dogs.
I have a friend. He has a big police dog named Jack. Police dogs are very clever. Every Sunday afternoon my friend takes the dog for a long walk in the park. Jack likes these long walks very much.
One Sunday afternoon, a young man came to visit my friend. He stayed a long time. He talked and talked. Soon it was time for my friend to take Jack out for a walk. But the visitor still stayed. Jack became very worried. He walked around the room several times and then sat down in front of the visitor and looked at him. But the visitor paid no attention. He went on talking. At last Jack got angry. He went out of the room and came back a few minutes later. He sat down again in front of the visitor, but this time he took the visitor’s cap in his mouth.

______ likes the long walks very much.

A. My friend

B. Jack


C. A young man
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