以下城市中，专门以政治作为城市区位因素的是
| A．巴西利亚、华盛顿、麦加 | B．巴西利亚、华盛顿、堪培拉 |
| C．罗马、巴西利亚、梵蒂冈 | D．华盛顿、堪培拉、巴黎 |
_____ three influenza type A virus subtypes(子类型) have been found in pigs.
| A．By far | B．As far as | C．So far | D．Till far |
_____, experts point out that students can easily fail at starting their business because of a lack of preparations.
| A．But | B．However | C．while | D．though |
It has always been the _____ of our goverment to encourage graduates to start their business.
| A．plan | B．campaign | C．procedure | D．policy |
The most important _____ of his speech at the G20 summit was that we should all unite to fight against the finanical.
| A．element | B．spot | C．view | D．point |
He directed exposure to pigs,otherwise he_______pig flu.
| A．couldn’t get | B．wouldn’t have gotten | C．couldn’t have got | D．woud get |