⑴5×69 (2)4×64 (3)85×9
⑷121×3 (5)47×5 (6)52×7
⑺8×44 (8)9×48 (9)209×2
积在300与400之间的算式有( )个.
下列是生活中的一些灭火实例,试分析其灭火的原因
You had better ____ (not eat) so much fried chicken. ____ (eat) too much ____(make) you unhealthy.