核不均一RNA是mRNA和rRNA的前体而不是tRNA的前体。 ( )
参考答案:错
黑社会势力在经济上强大以后,就会向政治方向发展。
Some of the objectives of the Grammar-Translation Method are______ and to train a better understanding of the first language.
A.to help students read literature
B.to make students exercise move
C.to provide students with good mental exercise
D.to have learners listen and speak more