如图所示，这是一个研究动物呼吸的装置，将该装置放在室温的环境中，经过一段时问后，

俄罗斯的母亲河是:

A．勒拿河

B．叶尼塞河

C．伏尔加河

D．黄河

飞龙夺命丹2功效与作用

Many students have hobbies, such as reading, painting, growing vegetables in their gardens, and looking after animals. Some hobbies are relaxing and (16) are creative. Hobbies can develop your interests and help you learn new skills.
David Smith is a student, and his hobby is writing. (17) the sumer of 2000, he spent four weeks on a summer camp. As well as the usual activities, such as sailing, climbing and mountain biking, there was a writing workshop with a professional (18) "She asked us to imagine that we were in a story. Then we wrote about our (19) at the camp. "
In senior high school David wrote a story about teenage life, and it (20) as a book in 2003. Many teenagers love his book, and as a result, David has become a (21) young writer.
David has been very lucky (22) his hobby has brought him enjoyment and success, but he is (23) interested in many other things. "I like playing volleyball, too" says David. "I spend some of my free time playing volleyball for my school team. (24) I’ll write more books in the future, but I’m not sure. "
It’s sometimes difficult (25) that we shouldn’t spend all our time on our favourite hobby. There are many other interesting things to do in life, and we should try to do something new or different.

Ⅱ. 完形填空/Cloze

A．Usually

B．Immediately

C．Maybe

D．Once

《甘肃省草原条例》规定如何来核定草原载畜量？