下列关于哺乳动物胚胎发育和胚胎工程的叙述，错误的是（ ）
—When Mum is at home, I have to practice every day, but she is on a business trip this week.
根据课文《狐假虎威》，选词填空。
假：①不是真的 ② 借 ③假如
假若明天天气晴好，我们就去郊外野炊。____
《狐假虎威》这篇课文真有趣。____
这张100元是真的还是假的？____
—Oh, my God! It's really heavy. I can't imagine how big it is! Is it an adult elephant?
