A：Obtaining not
B：Not obtaining
C：Not having obtained
D：Not obtained
He _______ his homework and is now listening to music.
—Who's that boy?—He is my cousin, and _______ name is Jack.
下列有关人类神经传导的叙述，正确的是（ ）
根据课文《植物妈妈有办法》组词。
已____ 甲____ 豆____ 识____ 纷____
经____ 如____ 好____ 娃____ 洼____
我国先后在南极地区建立了长城站、中山站和昆仑站三个极地科学考察站，建站时间一般选在2月份，其原因是此时（ ）
