大运河是由国家修建的最大的且最古老的内河水道系统。作为黄金水道，她在长期的发展中形成了独特的运河文化，并于2014年以仍在使用的“活态线性文化遗产”获准列入《世界遗产名录》。这（ ）
①表明了一定的文化由一定的经济所决定
②说明了运河文化是中华文化的重要标志
③是中华民族情感的集中展示和集中表达
④有利于研究中华文明的演进，保护民族记忆
| A．②④ | B．①③ | C．③④ | D．①④ |
Not only ______ polluted but ______ crowded.
| A．was the city; were the streets | B．the city was; were the streets |
| C．was the city; the streets were | D．the city was; the streets were |
The book I bought from the bookstore isn’t here. Who __________?
| A．could have taken it | B．must have taken it |
| C．might take it | D．should take it. |
The official made the demand that the soldiers _____ at once ______ battlefront.
| A．leave; for | B．leave; to | C．left; to | D．to be left; for |
— I will come to attend your lecture at 10:00 tomorrow.
— I’m sorry, by then my lecture will have ended and I _____ in my office.
| A．is being worked | B．will work | C．will be working | D．will have worked |
TheInternetin modern society hasbrought_______greatchangesinour daily life.
| A．about | B．out | C．back | D．up |