灌注混凝土人工捣实，其厚度不超过（）。
A、10cm
B、20cm
C、30cm
D、50cm
参考答案：B
我国的省级行政区共有
A．29个
B．31个
C．32个
D．34个
My uncle _______ potatoes at all. [ ]
A. don't like
B. doesn't like
C. isn't like
D. likes
