问题
选择题
Their teachers are very ______ to them. [ ]
A. difficult
B. boring
C. friendly
答案
答案：C
搜题请搜索小程序“爱下问搜题”
Their teachers are very ______ to them. [ ]
A. difficult
B. boring
C. friendly
答案：C
研究被测试者的血浆、肾小管以及输尿管中的液体，里面P、Q两种物质的浓度如下表所示，请问P、Q各是什么物质?( )
| 血浆 | 肾小管 | 输尿管 | |
| P | 0.03% | 0.03% | 2% |
| Q | 0.1% | 0.1% | 0 |
C.P是尿素，Q是蛋白质 D.P是尿素，Q是葡萄糖