The American Medical Association has called for the sport of boxing (拳击) to be banned.

单项选择题You should have blended the butter with the sugar thoroughly

单项选择题He has trouble understanding that other people judge him by his social skills and conduct.

单项选择题The book provides a concise analysis of the country's history.()

A. clean
B. perfect
C. real
D. brief

单项选择题Enormous sums of money have been spent on space exploration.

单项选择题The great change of the city astonished all the visitors．