Which of these words are usually stressed in a sentence: (select all that are correct)
A. to
B. wh- words
C. nouns
D. the
E. you
F. adverbs
G. adjectives
H. verbs
查看答案
In a sentence, some words are stressed more than others.
A. 对
B. 错
Structures words such asa, the, and, but, to, of, it,andyou are usually unstressed. They sound quieter and quicker.
A. 对
B. 错
If a word has more than one syllable, all the syllables are stressed.
A. 对
B. 错
蒸馏操作的依据是混合物中各组分的（ ）
A. 密度差异
B. 溶解度差异
C. 温度差异
D. 挥发度差异
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