多莉羊的诞生过程与3只羊有关：A羊提供乳腺细胞的细胞核，B羊提供去核的卵细胞，使两者融合，下一步将分裂形成的胚胎植入C羊的子宫内继续发育，诞生出多莉羊．多莉羊生出来后，和A母羊长得一模一样，因为遗传物质在____ 中．融合后的细胞进行细胞分裂所需要的能量是由细胞中____ 提供的．

选择合适的答案

①Did they go home by bike ?  ____            

②Where did you go yesterday ?  ____            

③What did you see ?   ____                    

④ Did you see a bus yesterday ?  ____           

⑤ When did your father come back ?  ____       

⑥ Do you live in London, too ?   ____          

⑦Did John eat rice yesterday ?   ____            

⑧How did you go home yesterday ?____           

⑨When did you come back ?   ____              

⑩What did she do yesterday ?  ____              

A No, I didn’t.   B Yes, he did .   C I went to the park .    D Yes, I do .

E I came back last Friday.   F No , they didn’t.    G We went home by bus .

H I saw lots of places .    I She watched TV.    J He came back last Sunday.

土壤板结不利于植物生长，原因是

架子上的药水共有1080毫升，每个小瓶里的药水是大瓶的 $\frac{1}{2}$ 。每个大瓶里的药水有

____毫升，每个小瓶里的药水有____ 毫升。