题目内容

In Britain,______has the ultimate authority of legislation.

A. the Monarch
B. the Cabinet
C. the House of Lords
D. the House of Commons

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维生素B1具有下列哪种结构

A. 异咯嗪环
B. 苯环
C. 环己环
D. 咪唑环
E. 噻唑环

______lie(s)between the boundary of Canada and the U. S. and serve(s)as the boundary between the two countries.

A. The Mississippi River
B. The Great Lakes
C. The Rocky Mountains
D. The Grand Canyon

The mother river in Canada is______.

A. St. Lawrence
B. River Columbia
C. River Shannon
D. the Murray

维生素C分子中酸性最强的羟基是

A. 2一位羟基
B. 3一位羟基
C. 5一位羟基
D. 6一位羟基
E. 4一位羟基