烧结使用的固体燃料只有煤。（）
参考答案：错
President Hu Jintao urged every effort _____ to rescue and treat the injured when the earthquake happened in Sichuan in 2008．
A．is made
B．must be made
C．be made
D．should make
税收的三大要素是（）。
A.纳税人
B.纳税环节
C.税率
D.征税对象
