PAGE可检测下列哪种病毒的核酸（）
A.肠道腺病毒
B.柯萨奇病毒
C.埃可病毒
D.杯状病毒
E.轮状病毒
参考答案：E
( )The meaning representation of words may change，becoming broader, narrower, or shifted．The word knight once meant “youth”，but was elevated in meaning in the age of chivalry；When Juliet tells Romeo，“I’m too fond.” She is not claiming she likes Romeo too much．She means “I am too foolish．”These are two examples of semantic broadening．
钢中磷的含量增加，钢的塑性和韧性（）。
A.下降
B.上升
C.不变
D.不确定
