清晨，朝阳初现，树叶下露珠晶莹剔透，形成露珠的物态变化是  （    ）

“我翻开历史一查，这历史没有年代。歪歪斜斜的每一页上都写着‘仁义道德’，几个字。我横竖睡不着，仔细看了半夜，才从字缝里看出字来，满本都写着两个字是‘吃人!’”这段文字的作者是（   ）

阅读理解

 Dear Grandma,

    Thank you for the new shorts. They are cool! It's hot in Beijing. It's sunny too. I can wear my shorts and T-shirt. I have a new jacket. My old jacket is too small. I want to buy a hat. It is fifty yuan. It's too expensive.

   What's the weather like at the farm? Is it warm? How many new ducks are there?

                                                                                                                                                                 Love

                                                                                                                                                                 John

Ⅰ．首先用pH试纸检测污水的酸碱性．三位同学分别进行如下实验：

甲：取pH试纸于玻璃片上，用玻璃棒蘸取待测液滴在pH试纸上，测得pH＜7；

乙：取pH试纸于玻璃片上，先用蒸馏水湿润，再用玻璃棒蘸取待测液滴在pH试纸上，测得pH＜7；

丙：取pH试纸直接浸入待测液中，测得pH＜7．

下列各句中，划线的成语使用恰当的一项是（   ）