【单选题】It ____hard when I was on my way home.
【简答题】根据所给汉语提示,写出空白处各单词的正确形式。每空限填一词。 Yesterday afternoon, when I was on my way home, it began to rain. I 1______ (感觉) worried, because I didn't 2______ (带) my umbrella. My hair and my clothes were all wet....
【简答题】词汇运用。 Yesterday afternoon, when I was on my way home, it began to rain. I (1)f______ (感觉) worried, because I didn't bring my (2)______ (雨伞). My hair and my clothes were all wet. When I went past a (3)...
【单选题】老唐有甲、乙、丙、丁四个儿子,下列情形下继承人仍享有继承权的是
【多选题】筛选寡核苷酸探针的原则:
A.
长18~50nt,较长探针杂交时间较长,合成量低;较短探针特异性会差些。
B.
G+C含量为40%~60%,超出此范围则会增加非特异杂交。
C.
探针分子内不应存在互补区,否则会出现抑制探针杂交的“发夹”状结构。
D.
避免单一碱基的重复出现(不能多于4个),如-CCCCC-。
【简答题】One afternoon,when I was on my way home, the sky 小题1: changed suddenly.Dark cloud were gathering. I began 小题2: to feel worrying because I didn’t have either a raincoat 小题3: or umbrella.It soon ...