下列哪一项属于功能矫治器()。
A.间隙保持器
B.垫舌簧矫治器
C.螺旋扩弓器
D.肌激动器
E.头帽
参考答案:D
The Chinese ___ less sugar and fat than many other countries in the world.
A.eats
B.eat
C.ate
D.have eaten
计算下面各题,能简算的要简算.
①35×1.25×2×0.8
②4.8÷(1.2+0.4)
③3.9×10.1.
④78+3.78×99
⑤(7.7+1.547)÷0.7.