哺乳动物肌肉细胞进行物质交换的直接环境是   (    )

将两只小灯泡接入电路中，并联比串联亮些。（  ）

加线词的用法与其他三项不同的是（    ）

根据句意及首字母提示完成单词 
Do you like eating ice cream in s ____?
M ____  is not everything, but we must have it. 
Don't run when you see a dog.  It is d____. 
Miss Smith is a good teacher,  and she t____  us English.
As a reporter,  he works for a m____.