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【单选题】
A是4×5矩阵，定义为A=Array[a,{4,5}]，提取【图片】元素，第2行全体元素，第3列全体元素应使用的语句分别是A.
A[[2,3]],A[2],A[[All,3]]
B.
A[[2,3]],A[2],A[All,3]
C.
A[[2,3]],A[[2]],A[[All,3]]
D.
A[[2,3]],A[[2]],A[All,3]
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【单选题】So loudly ______that the audience in the back heard him clearly.
A.
does he speak
B.
he speaks
C.
did he speak
D.
he spoke
【单选题】So loudly______ that the audience in the back heard him clearly.
A.
does he speak
B.
did he speak
C.
he speaks
D.
he spoke
【简答题】The teacher always talks in a _____ voice in class. He usually speaks______ to the class. (loudly, loud)
【简答题】( ) The clothes you wear will tell people what group of people you are. 2. ( ) The author realized he also judged people by their clothes although he complained about this before. 3. ( ) The...
【单选题】下列关于原癌基因和癌基因的叙述不正确的是
A.
原癌基因是人或动物细胞中固有的正常基因
B.
当原癌基因的结构发生异常或表达失控时，就会使原癌基因激活成为有恶性转化能力的癌基因
C.
癌基因在正常细胞中也存在
D.
必须消除癌基因才可以消除肿瘤
E.
基因点突变是导致原癌基因活化的主要方式之一
【简答题】根据句意及所给首字母，完成下列句子。 1. He often speaks loudly. We can't s _ . 2. —Let's go to a movie this Sunday! —That's a good i ______ 3. There isn't much money in my w _ 4. Li Yong is a famous h ...
【多选题】下列关于癌基因、原癌基因、抑癌基因叙述中,正确的是
A.
原癌基因是细胞生长、分化必需的基因
B.
病毒癌基因是病毒基因组中正常基因，是病毒增殖必需的
C.
抑癌基因是基因组中的一类奢侈基因
D.
细胞癌变说明细胞DNA一定发生了变化
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