【判断题】English diphthongs are divided into both falling diphthongs (the first vowel sound is pronounced longer, louder and stronger than the second one), and rising diphthongs (the second sound is produced l...
【单选题】东汉章帝时大司农郑弘奏请修筑的过岭通道是( )。
【判断题】English vowels consist of 12 monophthongs and 8 diphthongs.
【单选题】In 1900, the United States ranked first in the world in the production of______.
【判断题】操作性前提方案可不一定编写文件,但需要在组织内有效实施。
【判断题】There are three centring diphthongs and five closing diphthongs in English.