组成萜类的单体是（）
A.丙烯醛
B.乙烯醛
C.异丁二烯
D.异戊二烯
E.丙烯
参考答案：D
解析：萜类是异戊二烯的聚合体。
记账凭证账务处理程序的特点是根据记账凭证定期编制记账凭证汇总表，然后根据汇总记账凭证登记总账。 ( )
A．(A) David will be the general manager next week.
B．(B) David will get a promotion and a pay rise.
C．(C) David will work hard to be a general manager.
D．(D) David will be transferred to the accounting manager’s office.
