若|a|=3，则a的值是（   ）

阅读下面短文, 从短文后各题所给的四个选项(A、B、C、D)中, 选出可以填入空白处的最佳选项。
    One day,it was raining heavily and I didn't have an umbrella,I had just1a bus and had to walk back to my house.I2walking in that direction,when I heard somebody shouting,“Sister,”“Sister.” I looked back and3the stationery（文具）shopkeeper.I went to him and asked what was the4.He said that since it was raining heavily,I could take a5in his shop,have a look at his new6and go home when the rain stopped.For a moment I hesitated（犹豫）,but the7of getting to have a look at the pens made me nod.
    To my surprise,I found that the8was larger than I thought.The stationery shopkeeper offered me a chair and took out the pens for me.I9a beautiful parker（派克）pen and had a try.It10so smoothly that I wanted to buy it with all my heart,11as expected,it was very expensive.The shopkeeper said,“I can give you the pen for ninety-five dollars12one hundred.”I looked up and thanked him for the13,but refused politely as it was14quite expensive for me.By that time,the rain had15,and after appreciating his16,I quickly walked back to my house.
    After that day,the shop became my17place to hang out .The shopkeeper used to18me pens always at discount prices and very often also offered me tea.He had much information about all kinds of pens and other writing instruments.19both of us knew nothing about each other,we had a deep friendship based on our common 20.

牵牛花中，叶子有普通叶和枫形叶两种，种子有黑色和白色两种。现有普通叶白色种子纯种和枫形叶黑色种子纯种作为亲本进行杂交，得到的F₁为普通叶黑色种子，F₁自交得到F₂，结果符合基因的自由组合定律。下列对F₂的描述中错误的是（  ）

Li Hua's shoes are as _______ as Zhang Hui's.

用二分法求函数y=f（x）在区间2，4上零点的近似解，经验证有f（2）•f（4）＜0．若给定精确度ε=0.01，取区间的中点 ，计算得f（2）•f（x₁）＜0，则此时零点x₀∈____．（填区间）