一般认为妊娠6周前胚胎的辐射敏感性比6周后的胚胎
A.低B.完全相同C.差别不大D.高E.未肯定
参考答案:D
解析:一般认为妊娠6周前胚胎的辐射敏感性高于6周后的胚胎。
根据首字母或汉语提示完成下列句子(每空一词,每题一分,共10分)
小题1:You should try your best to _______ ________ _______ (改掉) such bad habits.
小题2:We simply cannot t_______ cheating in exams. (忍受)
小题3:E_________,I slid into bed and fell fast asleep.(感到累极了)
小题4:Don’t a______ the tiger! It is too dangerous.
小题5:The little girl was so_____ in reading that she forgot to have dinner.(专心于,专注于)
小题6:He found that _____ water carried the virus. (受到污染的)
小题7:When people____ ______ (提及,谈及)England, you find Wales included as well.
小题8:On my way to the station my car ________ ________ (抛锚,出故障)
小题9:My first _____ _____ our school is small.( 对…印象)
小题10:China _________ ________ more than thirty provinces .(由组成,构成)
中间______边缘______的透镜叫凹透镜,它对光有______作用.凸透镜能使平行于主光轴的光线会聚在一点,这点叫做______,这点到光心的距离叫做______.