矿产资源的开采，不论开采规模的大小，在安全和物质保证上都必须立足于保护矿山职工的人身安全。（）
参考答案：对
选词填空。
What colour, What time,
What, Where, Who
1. — is the canteen?
— It's on the first floor.
2. — Is your T-shirt?
— It's yellow.
3. — is that boy?
— He is my brother.
4. — is it?
— It's 7 :00.
5. — is that?
— It's a dog.
下列哪种正性肌力药物有血管扩张作用（）
A.维拉帕米
B.胺碘酮
C.地高辛
D.胰高血糖素
E.硝酸甘油
