8) A number of factors could account for the ....

　　9) It is no simple task to give the reason for ...

　　10) the cause of /reason for higher prices was an increase in demand.

　　11) Because/As/Now that/Since the demand has increased, the prices are higher.

　　12) An increase in demand causes/results in/leads to/produces higher prices.

　　13) the demand has increased.

　　14) therefore,/As a result,/For this reason,/Because of this,/Consequently, the prices are higher.

　　15) If there is an increase in demand, then prices rise./go up. /boost./are higher.

　　16) Different people look at...in different ways...

　　●表示不同看法的句型:

　　1) Different people have/hold different opinions/views on the question/problem/matter. Some believe that ...; Others argue that... :Still others maintain that ...

　　2) they are quite different from each other in their opinions.

　　3) Some people hold the opinion that it is good to ....

　　4) they think quite differently on this question.

　　5) Opinions vary from individual to individual, from culture to culture.

　　●表示必须,紧急,有困难做某事的句型:

　　1) It is important (necessary, urgent, difficult, easy, convenient, comfortable, expensive, desirable, advisable) for sb. to do sth.

　　2) ...have trouble/difficulty/a hard time/a difficult time (in) doing sth. (有困难做某事)

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