材料内部孔隙尺寸大小、形态特征对材料性能有什么影响？
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Shortly after the author left home one evening, she discovered that ______.
A. her son had brought his girlfriend home
B. her son had left home with his girlfriend
C. she shouldn’t have completely trusted her son
D. she should have taken the children along with her
According to the text “The Time Message”, time is dangerous because if you don’t make
The author went out and left her eldest son in charge of the younger children because
A. she knew that his girlfriend was a good baby-sitter
B. she could not find a baby-sitter on that winter night
C. the older children and the younger ones would get along well
D. she believed he was old enough to take care of the younger ones
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