在美国，股票指数期货交易主要集中于（）。
A.CBOT
B.KCBT
C.NYMEX
D.CME
参考答案：D
She knows how to make full use of her time and her parents never put________on her to work hard.[ ]
A. force
B. pressure
C. burden
D. weight
5- 4.8=2x是方程。[ ]
