A:细胞中氨基酰﹣tRNA合成酶至少有20种
B:图示核糖体上有两个tRNA的结合位点
C:一个tRNA分子可多次转运同一种氨基酸
D:图中核糖体沿着mRNA从右向左移动
隋朝大运河共分四段,自北向南分别是( )
①永济渠 ②通济渠 ③邗沟 ④江南河
根据短文内容,选出一个最佳答案填入题前的括号内。
Name
Personal Information
Norman Bethune
Born in 1890 in Canada
A doctor
Came to China in1938
Died in 1939 in China
Celine Dion
Born in Montreal, Canada
A singing star
In 1997, sang My Heart Will Go On for the film Titanic
Thomas Edison
Born in 1847, Kentucky, USA
Made over 1,000 inventions
Died in 1931
Bill Gates
Born in 1955 in the USA
Wrote Business @ the Speed of Thought
Owns Microsoft Company
Mark Twain
Born in 1835 in the USA
A writer
Wrote the Adventure of Tom Sawyer
Died in 1910
①他在羊圈____(juàn quān)外面画了一个大大的圆圈____(juàn quān)。
②更____(gèng gēng)羸得到大王的赞赏,更____(gèng gēng)加高兴了。
③我家门口新开了一家超市,东西很便____(biàn pián)宜,以后买东西就方便____(biàn pián)多了。