搜题请搜索小程序“爱下问搜题”
问题 填空题

有三个连续的自然数，中间一个用x表示，其他两个自然数分别是______和______．

答案

因为这三个自然数是连续的，中间的一个是x，

所以和它相邻的前一个是x-1，后一个是x+1．

故答案为：x-1，x+1．

完形填空

I asked my uncle, who plays __31_______ piano well, __32_______ he would assess (评定) the tone of a second hand piano I was hoping to buy. We arrived __33_______ the house and Uncle Frank looked the piano over, then __34_______ (sit) down and played a mixture of honky-tonk numbers and classical pieces. When he finished, we told the family that we would call ___35_______ in 15 minutes.

Outside, Uncle Frank said that ___36________ the wood was battered (坏掉的)，the sound was good and we should buy it.

When I phoned the woman back, she sounded as if she was crying. __37____ (concern), I asked, “What’s the matter?”

“We didn’t know the piano_38______ play like that,” she replied. The piano wasn’t __39_______sale, and her daughter had to resume(重新开始) taking piano __40___________.
查看答案
多项选择题

玻璃是以（）等为主要原料，在1550℃～1600℃高温下熔融、成型，然后经过急冷而制成的固体材料。

A.石英砂

B.纯碱

C.黏土

D.长石

E.石灰石
查看答案