In Britain,______has the ultimate authority of legislation.
A. the Monarch
B. the Cabinet
C. the House of Lords
D. the House of Commons
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
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