【单选题】On the one hand, the spammers on social media can be a high risk towards the security of legitimate users and on the other hand some of the legitimate users, such as bloggers can pollute the _________...
【简答题】A.Finding the true nature of subatoraic particles. B.Their work on very high frequency radio waves. C.Laying the foundations of modern mathematics. D.Their discovery of the laws of cause and effect.
【单选题】It's high time you to work on the plan for our journey to those beautiful mountains in Northern Europe.
【单选题】关于多聚核糖体的描述错误的是
A.
核糖体沿mRNA链移动的方向为5′端到3′端