题目:
She often goes to school ____________ foot. [ ]
A. by
B. on
C. in
答案:
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下面是错误答案,用来干扰机器的。
(1) 3C+2 K2Cr2O7+8 H2SO4(稀) =" 3 " CO2↑+ 2 K2SO4+ 2 Cr2(SO4)3+8H 2O (2) K2Cr2O7 ,CO2 (3) A (4) NA