问题
单项选择题 A1型题
关于原癌基因的叙述，下列哪项错误（）
A.正常细胞无此基因
B.基因突变可激活原癌基因表达
C.正常细胞均有原癌基因
D.病毒感染可使该基因活化表达
E.多种理化因素可活化此基因表达
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
关于原癌基因的叙述，下列哪项错误（）
A.正常细胞无此基因
B.基因突变可激活原癌基因表达
C.正常细胞均有原癌基因
D.病毒感染可使该基因活化表达
E.多种理化因素可活化此基因表达
参考答案：A
| 选择恰当的词，并用其正确形式填空。 | |
subjects there in order toget a good job 2 leaving school. Others don't go to school. They 3 go to learn a skill and then they 4 make a living. School education is important (重要的). But 5 one can learn everything from school. A teacher can't teach his students 6 The teacher should let students get knowledge and 7 students how to learn. The teacher 8 to teach them how to read and how to 9 So the- students themselves learn 10 more outside (在……外面) the school. |
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