《释名·释兵》：“剑，检也，所以防检非常也；又敛也，以其在身拱时敛在臂内也。”《释名》这般训释“剑”字是因为“剑”确实是有两个语源。
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声训材料和谐声材料都可以作为研究古音的语料。
A. 对
B. 错
Which group of the following vowels are front vowels?
A. /ʌ/ /з://ə/
B. /i://ɪ//e//æ/
C. /ɑ:/ /ɔ://ɒ//u://u/
English vowels can be classified based on 3 standards, which are ________.
A. the height of the raised part of the tongue
B. the part of the tongue raised
C. the position of the lips
The first sound of the diphthongs is generally ________, while the second one is weak, short and vague.
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