2017年，电视剧《人民的名义》热播，该剧反映了十八大以来党中央反腐败的高压态势，引发社会关注。这一现象说明（    ）

①反腐败是一切工作的中心      ②社会需要优秀影视作品

③反腐败符合人民的根本利益   ④人民直接领导反腐败斗争

根据短文内容及首字母提示，补全空格内单词，使短文完整、通顺。(请在答题卡上写出完整单词)

    It was sunny and h____ again at this time of year. John went to the beach to s____ his weekend. He was lying on the sand and l____ to music. Suddenly he h____ someone crying for help. He j____ up hurriedly and looked towards the voice. He saw a little boy waving(挥动) his hands in the w____ a little far away. He t____ off his clothes and jumped into the water

    q____ . He swam to the little boy, held him, kept his head a____  the water and swam back to the beach. At last, the boy was safe. He thanked John a l____ .

如图（甲）、（乙）所示是由相同的滑轮组装的滑轮组，甲 乙两人分别用两装置在相等时间内将质量相等的重物匀速提升相同的高度，空气阻力、摩擦、滑轮和绳子的质量均不计，下列说法正确的是（）

已知点 P 是椭圆 $16x^2+25y^2=400$ 上一点，且在 x 轴上方， $F_1{F}_2$ 分别是椭圆的左、右焦点，直线 $P{F}_2$ 的斜率为 $-4\sqrt{3}$ ，则 $△P{F}_1{F}_2$ 的面积是（  ）

用简便方法计算．

(16.5－3.2－1.8)×8.8