腭小凹位于（）
A.切牙乳突前方
B.腭皱与切牙乳突之间
C.腭皱后方
D.上颌牙槽嵴后缘
E.软硬腭交界处，腭中缝两侧
参考答案：E
最小的自然数是（ ），最小的质数是（ ），8比-9（ ）。
When a rescue vessel approaches a lifeboat in heavy seas，the person in charge of the lifeboat should（）.
A.tie up to the rescue vessel
B.transfer only those personnel who are not seasick
C.wait for calmer weather before transferring personnel
D.transfer all personnel immediately
