正确答案: A

3

题目：如果在一个顶点周围用两个正方形和n个正三角形恰好可以进行平面镶嵌，则n的值是（ ）．

解析：A

查看原题 点击获取本科目所有试题

举一反三的答案和解析：

[单选题]BTom lived a long way from the town．One day he went into the town to buy something in a shop，and after he bought it，he went into a restaurant and sat down at a table． When he looked round，he saw some old people put glasses on before reading their books，so after lunch he went to a shop to buy glasses，too． He walked along the road，and soon found a shop．The man in the shop made him try on a lot of glasses，but each time Tom said，"No，l can't read with this pair． "The man became more and more puzzled． At last he said，"Excuse me，but can you read at all?"No，l can't!"Tom said，"lf I can read，do you think I will come here to buy glasses?"

in a restaurant

解析：26．c[解析】由第一段第二、三句可知．

[单选题]15．

happened

解析：15．A【解析】该句意为“但是他说此事是发生在我来这里之后”。

[单选题]一月份我国气温最低的地方是：

漠河

[单选题]17．_________they may not succeed，they will try their best．

Though

解析：17．A【解析】此题考查连词的用法．由题意“虽然他们可能不会成功，但他们将尽最大努力”可知应选转折连词though。

[单选题]Are you going to borrow a dictionary or a magazine ? -- ____.

A dictionary

[单选题]中国是最早制定实施《应对气候变化国家方案》的发展中国家，也是近年来节能减排力度最大的国家。这表明我国

是一个和平、合作、负责任的国家

[单选题]Helen loves to talk about travel. She _____ many places.

has been to

[单选题]下列变化属于化学变化的是（ ）

水分解

[单选题]Dannydidallkindsofthingstomakethebaby______.

stopcrying