血液流经肾脏后,发生的主要变化是( )
A.养料增加
B.尿素减少
C.氧气增加
D.尿素增加
答案:B
Being both spoiled and lazy, he______everyone else for his lack of success.
A.accused
B.charged
C.criticized
D.blamed
临摹鸳鸯平飞姿势时,要体现出鸳鸯()。
A、脚收缩、头俯视
B、身弯曲、脚向前
C、足、头、尾呈平形
D、头俯视、脚向前