预防药物中毒性聋,应慎用耳毒性药物,尤其是具有下列哪些情形者()
A.老年人
B.婴幼儿
C.肾功能不全
D.已有耳聋者
E.有药物性聋家族史
参考答案:A, B, C, D, E
下面程序 main() { int x=32; printf("%d\n",x=x<<1); } 的输出是______。
A.100
B.160
C.120
D.64
According to the last paragraph, if changes are called for, some manufactures are more willing to change ______.
A.the image of a product
B.the function of a product
C.the quality of a product
D.the price of a product