姜夔用来改造晚唐以来软媚词风的方法是（）
A.以文为词
B.以论为词
C.以江西诗风入词
D.以西昆体诗风入词
参考答案：C
The pressure _____ causes Americans to be energetic, but it also puts them under a constant emotional strain (过度紧张).
A．to compete
B．competing
C．to be competed
D．having competed
属于自花授粉的作物有（）。
A.小麦
B.大麦
C.大豆
D.花生
