合理的营养不仅能够增进健康,而且也是()、()的有效手段。
参考答案:防治疾病;延年益寿
A boy with two dogs ____ when the earthquake rocked the city.[ ]
A. were sleeping
B. is asleep
C. was sleeping
D. are asleep
对大虾经行加工,首先先将大虾洗净,剪去()、虾须等部位,然后修整虾尾
A.虾枪
B.虾爪
C.虾头
D.虾尾