要观察到640倍的物像,应该选用的目镜、物镜分别是 ( )
A:5 x、10 x
B:10 x、10 x
C:12 x、40 x
D:16 x、40x
根据拼音写汉字。
①预zhào ____ ②轻yíng ____ ③líng ____纱
④lín ____波 ⑤崩tā____ ⑥点zhuì____
Large amounts of food ______ wasted in our school everyday, but the poor in many countries ______ no access to drinking water.