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【判断题】
设图G = (V, E)，其中V = {A,B,C,D}, E = {{A,B},{A,C},{A,D},{B,C},{C,D}}, 图G'={U,F}，其中U={A,B,D}, F = {{A,B}, {B,D}}，则G'是G的子图。A.
正确
B.
错误
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【单选题】We will also __ importance to pre-school education and care about special education.
A.
undertake
B.
regulate
C.
attach
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