患者男，40岁，因“查体发现主动脉弓增宽”来诊。既往有高血压病史。多普勒超声心动图：无名动脉与左颈总动脉间主动脉弓重度狭窄，并狭窄后扩张，直径6cm，累及左颈总动脉、锁骨下动脉起始部及锁骨下动脉远端6cm。
为进一步明确诊断，首选的检查是（）
A.主动脉造影
B.多排CT
C.经食管多普勒超声心动图
D.心脏MRI
E.目前已确诊，无须其他影像学检查
参考答案：B
| 完型填空。 | |||
| A thousand years age Hong Kong was covered by a thick forest. As more and more people came to __1__ in Hong Kong, these trees were cut down and burnt. Now there is __2__ forest left, though there are still some small areas covered in trees. We call these woods. Elephants, tigers and many __3__ animals were living in the thick forest. When people came to live in Hong Kong, the __4__ began to die out. Early  farmers grew rice and __5__ pigs and chickens in the valleys. They cut down the trees and burnt them. They needed __6__ to keep themselves warm in winter, to cook their food and to keep away the dangerous animals. Elephants quickly disappeared because there was not enough food for them. __7__ did most of the wolves and tigers. Monkeys and many other animals soon __8__ in the same way. You might think that there are no longer any animals in Hong Kong __9__ in the zoos. But there are still about 36 different animals __10__ there. One of the most interesting of Hong Kong's animals is the barking deer. These are beautiful little animals __11__ a rich brown coat and a white patch (补丁) under the tail. They look like deer but they are much smaller. They are less than two feel __12__. They make a noise rather like a dog __13__. In Hong Kong the barking deer has only a real enemy (敌人) — __14__. People hunt these little animals though it is illegal (违法的). There are now not many barking deer left. So it is important __15___ people to protect wild animals. | |||
| ( )1．A．work ( )2．A．many ( )3．A．other ( )4．A．people ( )5．A．grew ( )6．A．fire ( )7．A．So ( )8．A．lived ( )9．A．besides ( )10. A．live ( )11. A．have ( )12. A．high ( )13. A．shouting ( )14. A．tigers ( )15. A．to | B．study B．a few B．others B．animals B．made B．hotness B．Such B．died B．except B．to live B．without B．higher B．crying B．men B．for | C．live C．no C．the other C．plants C．got C．heat C．As C．came C．and C．lived C．with C．short C．barking C．wolves C．like | D．enjoy D．not D．another D．things D．kept D．stoves (炉子) D．Nor D．left D．or D．living D．get D．shorter D．talking D．elephants D．of |