题目

从微观角度认识化学，是学好化学的基础。（1）构成物质的微粒有分子、原子和_____。（2）构成氯化钠的微粒是_____、_____（填化学符号）。（3）请你从原子的角度解释质量守恒定律：_____。（4）从Na、Mg原子结构示意图推知，金属Na，Mg化学性质不同的原因是_____。（5）X2﹣与Ne的核外电子排布相同，则X的元素符号是_____。 阅读理解 　　Skin-diving isa new sport today．Thissport takesyou into a wonderful new world! It islike a visit to the moon! When you are under water, it'sea sy for you to climb big rock s, because you are no longer heavy． 　　Here, under water, everything isblue and green, during the day, there isenough light．When fish swim nearby, you can catch them with your hand s． 　　When you have tank s(箱; 罐)of air on your back, you can stay in deep water for a long time．But you mu st be careful when you dive(潜水)in deep water． 　　To catch fish isone of the most intere sting partsof thissport．Be side s(并且), there are many usesof skin-diving．You can clean shipswithout taking them out of water．You can get many thingsfrom the deepsea． (1) Skin-diving will take you to ________． [　　] A． the moon B． be in danger C． mountain s D． the deepsea (2) You can climb big rocksunder the water because ________． [　　] A． you are stronger B． the fish nearby helpsyou C． you aren't asheavy ason the land D． there islotsof light (3) Under water, a skin-diver ________ in the daytime． [　　] A． cansee everything B． can'tsee everything C． cansee nothing D． cansee only fishe s (4) With a tank of air on your back, you can ________． [　　] A． catch fish B． stay under water for long C． be in a safe place D． have more fun (5) Which of the following isNOT TRUE? [　　] A． Skin-diving isa new sport． B． Skin-diving islike visiting the moon． C． The only use of skin-diving isto have more fun． D． Skin-diving isboth intere sting and useful．