A:该反应是置换反应
B:若X是Al,R是Ag,则反应后溶液质量减少
C:X可能是Fe,R可能是Cu
D:X的金属活动性比R强
84
90
79
82
100
93
64
89
73
92
99
75
68
91
72
98
77
86
83
88
66
54
76
85
69
40
62
95
A. You're welcome.
B. What shape would you like?
C. I'd like some cherries, too.
D. What kind of pudding would you like?
E. Yes. I want to buy a pudding.
A: Can I help you?
B:____
A:____
B: I'd like a chocolate pudding.
B: I'd like a heart-shaped pudding.
A: Anything else?
B:____How much are they?
A: 70 yuan.
B: Here is the money.
A: Thank you.