强度是选用水泥的主要技术指标，GB175－1999规定，硅酸盐水泥分为（）个强度等级。
A．3
B．4
C．5
D．6
参考答案：D
The president has decided to put _____ he thinks is energetic, experienced and has good qualities in the position of the leadership of the firm.
A．those who
B．anyone
C．whomever
D．whoever
与甲状腺功能亢进无关的表现是（）。
A.肠蠕动减慢
B.神经兴奋性升高
C.心率加快
D.甲状腺肿大
E.基础代谢率明显升高
