细胞癌基因的叙述正确的是()
A.存在于正常生物基因组中
B.存在于DNA病毒中
C.又称为病毒癌基因
D.存在于RNA病毒中
E.正常细胞含有即可导致肿瘤的发生
参考答案:A
Find out the mistakes and correct them. 找错,并改正。
( ) 1. This are a pencil.
A B C
( ) 2. Is it Danny marker?
( ) 3. This is a glue.
( ) 4. These are pencil.
(2014·安徽七校联考)It is difficult for children to change their eating habit later in life.________,parents should encourage healthy eating from an early age.
A.Otherwise
B.Therefore
C.Besides
D.However