两大洋快餐巨头麦当劳、肯德基近期纷纷降价促销，降幅达到三成左右，这引发了中西快餐新一轮竞争。麦当劳、肯德基降价促销和中式快餐争顾客体现的经济学道理是（ ）
①麦当劳、肯德基和中式快餐互为替代品
②麦当劳、肯德基和中式快餐是互补品
③麦当劳、肯德基消费的增加使其替代品的消费减少
④麦当劳、肯德基降价能够剌激消费，抢占市场
| A．①②③ | B．①③④ | C．②③④ | D．①②④ |
What ______ public is concerned about is whether medical workers and scientists will be able to find _____ cure for this new disease in a short time .
| A．不填；a | B．不填；the | C．the ; 不填 | D．the ; a |
----- Have you watched the football match last night ?
----- Yes. It was exciting . It was a really _____ one.
| A．closely | B．close | C．closing | D．closed |
He proposed that we _______ a meeting , which suggested he ________ in our plan .
| A．held; was interested | B．hold; was interested |
| C．should hold ; be interested | D．should hold ; interested |
____ a cure for the disease , very few advances have been made in the last few years ..
| A．Considering | B．Regarding | C．Supposing | D．Providing |
It ______ Sunday , the Smiths will go to the seaside and enjoy themselves again .
| A．is | B．being | C．had been | D．having been |