3．It is a good city for cycling because it is flat and therefore is convenient for bikes.

它是一个适合骑自行车的城市因为它地势平坦，所以对于自行车来说很是便利。

[归纳拓展1]

therefore adv.所以；因此

[语境助记1]

(1)A fish is a cold­blooded animal and therefore is very sensitive to water temperature.(2015·广东)

鱼是冷血动物，因此它对水温很敏感。

(2)Their car was bigger and therefore more comfortable.

他们的汽车更宽敞，因此也更舒适。

[易混辨析]　therefore，so

(1)therefore正式用语，为副词，常用于数学、逻辑或其他精细的推论中，特别用以表示严密的推理；连接两个并列分句时，其前常用分号。

(2)so可作连词，直接引导一个完整的句子，常用于简洁的会话和日常的文体中，推理不必严密。

[题组训练1]

用therefore，so的正确形式填空

(1)He was very tired，and he didn't give the market report.

(2)The students often broke the school rules. she thought of some rules and made them follow them.(2015·广东)

(3)He was down with the flu； he couldn't come to the party.

[归纳拓展2]

(1)convenient adj.方便的，便利的

It's convenient for sb.to do sth.某人做某事是方便的。

(2)convenience n．方便，便利；便利的事物，便利设施

for convenience为方便起见

at one's convenience在某人方便的时候

(3)conveniently adv.方便地，便利地

注意：(1)convenient作表语时，其主语不能是人，一般是sth.或it。类似的词还有：possible/impossible，necessary/unnecessary等。

(2)convenience意为"方便，便利"时，用作不可数名词；意为"便利的事物，便利设施"时，用作可数名词。

[语境助记2]

(1)Smartphones make it easier and more convenient to watch video clips，read weibo.(2016·江苏)