核糖体核糖核酸(rRNA, ribosomal robonucleic acid)
参考答案:
作为核糖体组成成分的一类RNA,rRNA是细胞内最丰富的RNA。
—Did you scold him for failing in the maths test?
—Yes, but I'd rather I _______. [ ]
A. wouldn't
B. didn't
C. shouldn't
D. hadn't
若a的值为3;下列程序段被执行后,c的值是( )。 c=l; if (a>O) if (a>3) c=2; else c=3; else c=4;
A.1
B.2
C.3
D.4