磷酸二羟丙酮是哪两种物质代谢之间的交叉点？（）
A.糖-氨基酸
B.糖-脂肪酸
C.糖-甘油
D.糖-胆固醇
参考答案：C
What made the little boy so upset was that the toy car________had been lost.[ ]
A. he took pride in it
B. that he was proud
C. he was proud of
D. which he took pride
---Let's ______ chess.
---That _________ good.[ ]
A. play the, is
B. play , is sound
C. play the, sounds
D. play , sounds
ess.