长方形的长扩大到原来的3倍，宽不变，面积就扩大到原来的[ ]
A．3倍
B．6倍
C．9倍
答案：A
The police recommended parents __________their children under 12 to ride to school for safety.
A．not allow
B．do not allow
C．mustn’t allow
D．couldn’tallow
