题目

下列关于胚胎发育的正确顺序是（    ）①组织分化  ②受精卵分裂   ③形成胎儿  ④形成器官 ⑤分娩A ②③④⑤①    B ①②③④⑤    C②④⑤①③   D②①④③⑤  答案：D解析:胚胎发育的顺序是受精卵形成后，会不断分裂，分化，形成组织，再由组织形成器官，到第8周末，已露出人的雏形，也就是胎儿，胎儿在子宫里发育成熟，排出的过程叫做分娩。 词汇运用（本大题有10小题，共10分）小题1:An accident may happen if you don’t have a driver’s __________（执照）。小题2:Students are not  a___________ to use calculators in the exam.小题3:He was very happy that he made few _____________ (错误) in  his written test.小题4:He is used to taking ___________ (笔记) in class.小题5:Lu Xun is my favorite a________. I have lots of his books.小题6:Three monkeys ____________ (逃脱)from the local zoo last  night.小题7:There is something wrong with one of my____(tooth)                 小题8:She was __________ (害怕)when she saw a snake.小题9:Taiwan b        to China forever.小题10:We are learning English, so we are all English              . (learn)