贾府的“四春”分别是：孤独的____、懦弱的____、精明的____、孤僻的____。
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According to WTO''s definition of tourism, outbound tourism refers to ____.
Fill in the blanks with the words givenbelow. Each word is marked with a letter. You should decide on the best choice.
连续两次鼻饲的间隔时间应不少于（）
A. 1.0小时
B. 1.5小时
C. 2.0小时
D. 2.5小时
E. 3.0小时
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