利用图示的“坐位体前屈测试仪”进行身体柔韧性测试。测试者向前推动滑块，滑块被推动的距离越大，仪器的示数就越大。某同学设计了四种电路，要求电路中滑动变阻器的滑片向右滑动时，电表示数增大。其中符合要求的电路是（  ）

将下列句子译成英语，并将所译句子写在答题卡标有题号的相应横线上。

根据短文理解，选择正确答案。

Down by the salley gardens

my love and I did meet;

She passed the salley gardens

with little snow-white feet.

She bid (请求) me take love easy,

as the leaves grow on the tree;

But I, being young and foolish(傻的),

with her would not agree.

In a field by the river

my love and I did stand,

And on my leaning shoulder(肩膀)

she put her snow-white ______.

She bid me take life easy,

as the grass grows on the weirs(河堰);

But I was young and foolish,

and now am full of tears(眼泪).

有一两岸平直、流速恒定的河流．某人驾驶小船渡河，去程时船头指向始终与河岸垂直，回程时行驶路线与河岸垂直，船在静水中的速度大小相同，且小船在静水中速度与河水流速大小的比值为k，则去程与回程所用时间之比为（   ）