A:①②
B:③④
C:②③
D:②④
_____of the money will go to the Red Cross to help those who need help.
求证:∠BAD=∠E
下列生殖方式为卵生的脊椎动物是( )
母亲怀孕期间,胎儿通过脐带和胎盘从母体吸取营养.(判断对错)