斗轮机回转轴承在热带、（）以及连续工作时，应缩短润滑周期。
A、湿度大；
B、灰尘多；
C、温度变化大；
D、空气干燥。
参考答案：A, B, C
阅读理解。选择正确的答案，将其序号填在题前括号里。
I have two good friends. They are Ma Yi and Gao Wei. Ma Yi is a girl. She's thin and short. She has
long hair and big eyes. Gao Wei is a boy. He's tall and strong. He has short hair and a small nose.
1. ____________ has long hair and big eyes.
A. Ma Yi
B. Gao Wei
C. I
2. Ma Yi is _____________.
A. tall and thin
B. tall and strong
C. thin and short
3. Gao Wei is a _____________, Ma Yi is a _____________.
A. girl, boy
B. boy, girl
C. teacher, student
4. _____________ is tall and strong.
孙中山先生在其遗嘱中说：“必须唤起民众，联合世界上待我平等之民族，共同奋斗。”在他一生的斗争中，最典型地体现了这一思想的是：（）
A、三民主义
B、新三民主义
C、三大政策
D、北上宣言
