凡·高的绘画通过强烈的色彩对比来表达他对生活的热爱，其代表作是(    )

Dear Frank,

    How's it going? How's the weather in Boston? I'm fine. Thank you for your photos and your letter. In your letter, you say you will soon have a long exciting vacation. You are arriving in China for it, aren't you? It's cool and sunny here now, just for visiting. And would you like to come to my house? Let me tell you the way to my house.

    You can take the No.8 bus from the airport (机场). Then you will pass a hotel on your right and go along Renmin Street. Then you go through Heping Street, Center Street and Long Street. When you see a beautiful garden, turn left. Then you go down

    Bridge Street and turn left at New Park. You can see a house with a big tree next to it. That's my house. You can find it easily. Hope you have a good trip.

Yours,

Mingming

根据短文内容，选择正确答案

如图，平行板电容器经开关K与电池连接，a处固定有一带电量非常小的点电荷．K是闭合的，U_a表示a点的电势，E表示两板间的电场强度，F表示点电荷受到的电场力．现将电容器的B板向下稍微移动，使两板间的距离增大，则（   ）

根据句意及汉语提示补全句子

有一种爱，是至深至纯的，无微不至的，不求回报的。这种爱是（   ）