题目内容
（请给出正确答案）
[主观题]
The pressure ______ causes Americans to be energetic, but it also puts them under a consta
nt emotional strain.
A．to compete
B．competing
C．to be competed
D．having competed
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敦煌莫高窟最鼎盛的雕塑、彩绘艺术多是出于哪个朝代？（）
A.北周
B.隋朝
C.唐朝
D.宋朝
