当一事物存在时，其自身已经包含着自我肯定和自我否定的因素，构成事物自我发展的内在基础。( )
参考答案：对
当你发现显微镜镜头不清洁时，处理的正确方法是[ ]
A．用擦镜纸擦
B．用抹布擦
C．用纸巾擦
D．用纱布擦
冠词填空。
1. His father, who is ______ honest man, is teaching in ______ university.
2. Which is heavier, ______ elephant or ______ horse?
3. ______ cold wind was blowing from the north.
4. He is always ready to help ______ old and ______ young.
5. ______ Greens are traveling in ______ South China.
