写一写。

小池塘(节选)

白云倒映在池塘里，像一群白鹅。太阳倒映在池塘里，像一只鲜红的气球。月牙倒映在池塘里，像一只弯弯的小船。星星倒映在池塘里，像许多闪亮的珍珠。

这段话一共____句话。这段话讲了天上的____、____、____和____倒映在____里的样子。

下面四种家用电器中，利用电流热效应工作的是（　　）

如图所示，电动势为E、内阻为r的电池与定值电阻R₀、滑动变阻器R串联，已知R₀=r， 滑动变阻器的最大阻值是2r．当滑动变阻器的滑片P由a端向b端滑动时，下列说法中正确的是（    ）

$\frac{3+i}{1+i}$ =（    ）

    Sam is a four year old boy. He lives in the USA with his father and mother. His father works in a hospital. He goes there by subway. He can read books on it. His mother is a worker in a factory. She often walks to work. They usually do some shopping on Sundays for the next week. But this Sunday they are going to the park to have a picnic because it is Sam's birthday.

    Look, Sam has many birthday gifts(礼物). One of them is a nice drum. He likes music. Of course Sam likes the drum very much. He makes a noise with it all day. His parents don't mind. They are happy. But one of the neighbours(邻居)doesn't like the noise. One day, she brings a knife and says to Sam, “Sam, do you know, there's a very nice gift in your drum. Here's a knife. Open the drum and let's find it. ”“OK!”Sam answers.