“十月怀胎,一朝分娩.”胎儿在母体内的发育场所是( )
A:子宫
B:卵巢
C:输卵管
D:胎盘
读澳大利亚和美国本土农业带分布图及两国地形剖面图,完成以下题目:
Mike
saw a film
John
cleaned the room
Wu Yifan
had a cold
Chen Jie
read a book
Zhang Peng
went fishing
在“用托盘天平称物体的质量”的实验中,下列操作错误的是