阅读下面短文，从每小题所给的A、B、C、D四个选项中选出最佳选项。

C

    It's not just gloves that can help people keep warm in winter. Love can, too.

    A pair of 16-year-old American twins, Jack and Jake Moran, started a program called "Warm Hearts, Warm Hands" last month. Their aim was to collect new and used gloves with fellow students at Richards High School.

    "We started this program a few weeks ago after we saw something on the news about a student who got frostbite(冻伤的）riding his bike to school," Jack said. "I just kind of realized that there are so many kids who don't have or wear gloves. The school has started the collection competition among classes, and the class that collects the most gloves gets a pizza party.

    The twin brothers talked to other students about their program. Many teachers also joined in, bringing in gloves and encouraging their students to help meet the needs of local community members.

    "The conversations we are having now aren't so much about what actions we can take, but about ______▲_____ .This program has really shown me that I don't need to get on a plane and go to help refugees(难民）to make a difference. I can do it right here. I can do it every day." Jake said.

    More than 500 pairs of gloves have been collected in a month and more donations(捐赠品） are coming in every day, including hats and scarves.

在研究匀变速直线运动的实验中，如图为一次记录小车运动情况的纸带．图中A，B，C，D，E为计数点，相邻计数点间还有4个点（图中未标出），计算计数点的瞬时速度υ_B=____m/s，小车的加速度a=____m/s²

已知f(x)是定义域为R的奇函数，f(-4)=-1,f(x)的导函数f'(x)的图象如图所示。若两正数a,b满足f(a+2b)<1，则$\frac{a+2}{b+2}$的取值范围是（ ）

如图是测定滑轮组机械效率的实验装置，小明测量的有关数据如下表所示：
（1）请你根据表中数据在图中画出实验时滑轮组的绕线情况，并补全表中的空格。____ 
（2）若提升的钩码重增加到6N，则该滑轮组的机械效率将____ （填“变大”、“变小”或“不变”）。
（3）小明在实验过程中，应当____ 拉动弹簧测力计，才能使弹簧测力计的示数保持稳定。