光学合像水平仪的水准管在测量中起（）作用。
A.定位
B.读数
C.示值
D.校正
参考答案：A
甲亢的常见典型表现除外 （）
A.黏液性水肿
B.甲状腺弥漫性肿大
C.眼球突出
D.怕热多汗
E.心动过速
In the past few years, My Heart Will Go On was a popular song among young people, _____were often heard singing it at parties．
A．who
B．which
C．they
D．that
