问题
选择题
Early American settlers were great_____ -- they could build almost anything from wood.
A．engineers
B．carpenters
C．builders
D．entertainers
答案
答案：B
考察名词辨析。A工程师；B木匠；C建筑工人；D娱乐人员；根据后面的build almost anything from wood可知是木匠。故B正确。
残根，在进行了右侧上牙槽后神经阻滞麻醉及腭大孔麻醉后，分离颊侧近中牙龈时患者仍有痛感。最可能的原因是（）