对淀粉酶有激活作用的离子是（）
A.Na+
B.Cl-
C.Cu2+
D.Ca2+
E.K+
参考答案：B
1. They got to Beijing at about 9：00 yesterday. (改为同义句)
They _________ _________ Beijing at _________ 9:00 yesterday.
2. Mike is very tall. (改为感叹句)
_________ _________Mike is !
3. I called the police while the alien was visiting the museum.？(改为一般疑问句)
_________ you _________the police while the alien was visiting the museum？
尿液检查项目中哪一项对诊断泌尿系结核没有意义（）
A.尿液显微镜检查
B.尿找结核菌
C.尿pH值检查
D.尿比重
E.尿结核菌PCR检测
