Jessica can ________ Chinese very well. [ ]
A. say
B. talk
C. tell
D. speak
答案:D
某一患儿疑为结核,用浓度为1:10000浓度的旧结核菌素做试验,72小时后观察,局部红硬,直径在1.5cm,可判断为
A.弱阳性B.中度阳性C.强阳性D.可疑阳性E.极强阳性
如果反比例函数的图象经过点(2,-3),那么它的函数解析式为______.