题干
We think it is important to learn ______ English ______ Chinese well.
A：/; or
B：either; or
C：not; but
D：both; and
答案(点此获取答案解析）
D
We think it is important to learn ______ English ______ Chinese well.
A：/; or
B：either; or
C：not; but
D：both; and
，它们相交于A，B两点，则线段AB的长为（ ）
2H2O+O2↑ ② CuO+H2△Cu+H2O
3Fe+4CO2 ④ 2KI+Cl2====2KCl+I2