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【单选题】
核酸探针指由人工标有特定标志物的单链核酸（DNA或RNA）片段，它能以碱基配对互补的方式与具有对应碱基序列的单链核酸结合，用来检测样品中的核酸与探针是否具有同源性，以及同源片段的大小。关于核酸探针，与cDNA探针的特点不相符的是（）A.
标记方法成熟，有多种标记方法可供选择
B.
可以克隆到质粒载体中进行无限繁殖，制备方法简便
C.
适用于基因表达的检测
D.
相对于RNA而言，cDNA探针不易降解
E.
不含有基因的内含子序列，用于检测基因表达时杂交效率要明显低于DNA探针
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【简答题】幼小衔接工作方案制订的要求
【单选题】-- If only I _______ the teachers instructions, in which case I ______ not so unlucky now. -- It’s high time that you _______ yourself.
A.
followed; am; should reflect
B.
had followed; would have been; reflected
C.
would follow; would be; reflect
D.
had followed; would be; reflected
【单选题】The experience of the foreign teacher in Chengdu reminds us of a Chinese saying 'a fall into the pit, a gain in your wit'.
A.
Y
B.
N
C.
NG
【简答题】Why the foreign teacher succeeded in getting PAID was due to the situation in which the number of foreign teachers ______of so many desperate schools.
【简答题】The main measure the foreign teacher takes to get paid is ______.
【单选题】Only when I left my hometown ________ how precious it is to me. [ ]
A.
did I realize
B.
I realized
C.
had I realized
D.
I had realized
【简答题】幼小衔接工作方案制订的要求有几点
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