下列关于细胞融合及培养等过程的叙述正确的是
A:若a、b分别代表被子植物的一个精子和一个极核,则d细胞为受精极核
B:若a、b是两种植物的原生质体,则培育N植株的原理是细胞增殖
C:若N植株比M植株光合作用效率高,原因之一可能是前者具有双亲的叶绿体
D:理论上,不能用类似单克隆抗体的制备方法在体外大量生产干扰素
—What's the meaning of"One Belt and One Road"?
—Let me ________ the words in the new dictionary.
酸雨是指雨水具有较强酸性,pH小于5.6的雨水.下列有关酸雨的叙述不正确的是( )
根据短文,选择正确选项。
One day, the teacher asks the boys and girls a question. “Swallows(燕子) fly to the south before winter1,”he says. “But why don't cats and dogs do2?” Fox lifts (举) his3as usual. “Yes, Fox?” says the teacher4. Fox stands (站) up and says, “5they have no wings (翅膀).”