问题
选择题
Miss Hyde usually spends 20 dollars _____ every week. [ ]
A. buys books
B. buying books
C. to buy book
D. buy the book
答案
B
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Miss Hyde usually spends 20 dollars _____ every week. [ ]
A. buys books
B. buying books
C. to buy book
D. buy the book
B
有甲、乙两组物质，其中甲组的（ ）能跟乙组的所有物质发生反应；乙组的（ ）能跟甲组的所有物质发生反应．
| A． | B． | C． | D． | |
| 甲组 | CuSO4 | FeCl2 | H2SO4 | CO2 |
| 乙组 | Fe | Na2CO3 | Fe（OH）3 | KOH |
A．A
B．B
C．C
D．D