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【简答题】
如图所示为研究气体扩散的实验装置，两个瓶中分别装有二氧化氮气体和空气，其中二氧化氮气体的密度大于空气的密度，为了增强实验的可信度，下面一只瓶里应装入 ______气体，扩散实验说明了 ______．
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举一反三
【单选题】The little boy prefers ________ outdoors to _______ at home.
A.
playing; to read books
B.
playing; reading books
C.
play; read books
D.
to play; reading books
【单选题】The little boy takes ____ in reading history books.
A.
deal
B.
delight
C.
demon
D.
dile
【单选题】--- How many books does the little boy have? ---He has books.
A.
two thousands
B.
one thousand of
C.
thousands of
D.
two thousands of
【简答题】The little boy _____ (gets much pleasure from)reading history books.
【简答题】Fill in the blanks with the words given in the box. Change the form where necessary. purchase maximum evidence assess prosperous encounte r disposable justify unwieldy margin (1) The little boy likes ...
【简答题】assess, evidence, margin, prosperous, maximum① The little boy likes to make notes in the ______ of books.
【简答题】胸大肌和背阔肌近固定同时收缩可使肩关节______和_________。
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