“革命失败以后，革命的主观力量确实大为削弱了。剩下的一点小小的力量，若仅依据某些现象来看，自然要使同志们（作这样看法的同志们）发生悲观的念头。但若从实质上看，便大大不然。……这就是说，现在虽只有一点小小的力量,但是它的发展会是很快的。它在中国的环境里不仅是具备了发展的可能性，简直是具备了发展的必然性……”上述***关于中国革命的论述发表于（   ）

阅读理解

A

　Here are some English study skills for beginners.

　　★Listening

　　Listening is a great way to improve your pronunciation and intonation (语调). You can start by listening to short stories for children because they are usually easy.

      ★Reading

　　Reading is a good way to help you learn new words. And it will also help you learn English grammar. Children's books are great for beginners.

       ★Vocabulary

　　When you come across new words in the reading, write them down in your notebook. You can write down the translation in your native language to help you understand.

  　★Speaking

　　While doing your reading exercises, read them aloud.You can also look for some articles on the Internet to read.

 　　Learning any language needs practice—lots of practice.You don't have to spend hours studying each day; just 30 minutes a day for four or five days a week will help you improve it.

某种气体在不同温度下的气体分子速率分布曲线如图所示，图中f（v）表示v处单位速率区间内的分子数百分率，由图可知（   ）