问题
选择题
My friend Li Xiao knows my hometown very well because he ______ there many times with me. [ ]
A. has been
B. has gone
C. had gone
D. went
答案
答案：A
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My friend Li Xiao knows my hometown very well because he ______ there many times with me. [ ]
A. has been
B. has gone
C. had gone
D. went
答案：A
下表为人和一些动物的发声频率范围和听觉频率范围，参照表格回答：
| 发声频率范围（Hz） | 听觉频率范围（Hz） | 发声频率范围（Hz） | 听觉频率范围（Hz） | ||
| 人 | 85～1100 | 20～20000 | 蝙蝠 | 10000～120000 | 1000～120000 |
| 狗 | 452～1800 | 15～50000 | 海豚 | 7000～12000 | 150～150000 |
| 猫 | 760～1500 | 60～65000 |
（2）地震前夕，一些动物有异常反应，如老鼠出洞、鸡鸣狗叫等，而人却感觉不到，这是为什么？