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睡眠时间还多少与性别有关，通常女性比男性平均睡眠时间（），现代研究认为可能与性激素分泌差异有关。
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【简答题】In every cultivated language there are two great classes of words which, taken together, comprise the whole vocabulary.First, there are those words 1 which we become acquainted in daily conversation, ...
【简答题】Rewrite the highlighted parts in the following sentences, suing neither, nor or so . 1) Our society has changed and the people in it have changed . 2) Petro is not an engineer-in-chief, his ...
【单选题】The main idea of the passage is that ______.
A.
the two kinds of words, popular and learned words, are both important in a cultivated language
B.
it is easy to learn popular words in a language
C.
we must make great efforts to learn learned words
D.
learned words are more important than popular words
【简答题】Two popular language constructs to print output in PHP are___and____
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