低密度脂蛋白胆固醇（）。
A.TC
B.TG
C.HDL-C
D.LDL-C
E.CM
参考答案：D
—The summer vacation is coming in a few days. I'll share the holidays with my daughter by traveling.
—_______. [ ]
A. Congratulations!
B. Nice to meet you!
C. Have a good trip!
D. It's very kind of you.
提出“无为无不为”的道德原则的是（）
A、老子
B、庄子
C、杨朱
D、惠施
