问题
选择题
They ______ English lessons on Friday. [ ]
A. doesn't has
B. doesn't have
C. don't have
D. aren't have
答案
答案：C
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They ______ English lessons on Friday. [ ]
A. doesn't has
B. doesn't have
C. don't have
D. aren't have
答案：C
下列各组物质，不能按照关系X—Y—Z—X（“—”表示反应一步完成）相互转化的是
| 物质 | A | B | C | D |
| X | CaO | BaCl2 | Cu(NO3)2 | K2SO4 |
| Y | CaCl2 | Ba(NO3)2 | Cu(OH)2 | KCl |
| Z | CaCO3 | BaCO3 | CuSO4 | KNO3 |