用某种金属制成粗细均匀的导线，通以一定大小的恒定电流，过一段时间后，导线升高的温度（   ）

化简：$\frac{6a}{8y}·\frac{2y^2}{3a^2}$=____ .

What is known to all is that up to now China has made a great ___________ to preserving the peace.

选择适当的关联词。

_____风吹雨打，我们_____要坚持到校学习。

阅读短文，回答下面的问题。
    I'm John．My father's birthday is on January 5th．My mother's birthday is in January，too．My birthday is on April 4th．My brother's birthday is on November 2nd．Today is my sister's birthday．Her birthday is on October 3rd．It's her eleventh birthday．I buy a big cake for her．We have a birthday party in the evening．