患者男性，33岁，残冠，根尖病变。拔除过程中，远中颊根折断，取根时，牙根突然消失。捏鼻鼓气时拔牙窝内有气体溢出

此时进行X线检查首选的投照方法是（）

A．头颅正位片

B．通的上颌侧位断层片

C．头颅侧位片

D．全口曲面断层

E．上颌体腔片

Which of the following statements is closest in the meaning that expressed in the passage().

A. Most college students lack ascertained level of proficient skills.

B. Universities should do more to better prepare those college students.

C. It’s irresponsible for universities to send students into workforce when they’re unprepared and unskilled.

D. All of the above.