把红热的木炭伸入盛有氧气的集气瓶，为什么应该由上往下，慢慢地伸入？

"The top Democrat on the House Education Committee, Rep. George Miller of California" means that Mr. George Miller is ______.

A．from the State of California, a representative of his state at the House of Representatives, and a Republican Party member, and he sits on the Education Committee of the House of Representatives of the United States of America

B．a Republican representative from the State of California, a representative of the House of Representatives of the USA to the State of California, and the top Democrat on the Education Committee of the House of Representatives

C．a representative of the State of California to the House of Representatives of the United States of America, a member of the Democratic Party, and a member on the Education Committee of the House of Representatives

D．a top Democrat representing George Miller from the State of California, a Republican Party member at the House of Representatives, and a member of the Education Committee of the House of Representatives of the United States of America