腮腺最常见的良性肿瘤是（）。
A.血管瘤
B.混合瘤
C.淋巴瘤
D.脂肪瘤
E.纤维瘤
参考答案：B
具有调节汗孔开合作用的气是什么气
A．元气B．宗气C．营气D．卫气E．心气
"A Pandora’s box" refers to a present or something （）.
A．which brings happiness but looks ugly
B．hich looses a swarm of evils upon mankind
C．which can create anything its owner wants
D．which seems valuable but brings misfortune
