用网喷混凝土加固基坑壁施工时，应优先选用硅酸盐或普通硅酸盐水泥，也可选用矿渣或火山灰硅酸盐水泥，水泥强度等级不应低于()。
A. 25
B. 30
C. 32.5
D. 35
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He bought a birthday present from his mother.
A. Right.
B. Wrong.
C. Doesn't say.
His mother liked the bird very much.
A. Right.
B. Wrong.
C. Doesn't say.
欧洲货币就是境外货币。()
A. 正确
B. 错误
This room is ______ the room upstairs.
A. bigger than
B. more bigger than
C. bigger then
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