我国粮食产量十连增背后,是频频告急的土地污染,步步逼近的耕地红线……为确保中国人的饭碗牢牢端在自己手中,部分人大代表向十二届全国人大二次会议提交尽快制定粮食安全法的议案。这表明（  ）

①人大代表有权监督政府的行为 ②人大代表行使提案权,坚持对人民负责

③全国人民代表大会享有立法权 ④人大代表行使决定权和监督权

从边长为（a+1）cm的正方形纸片中剪去一个边长为（a﹣1）cm的正方形（a＞1），剩余部分沿虚线又剪拼成一个矩形（不重叠无缝隙），则该矩形的面积是____ 

公比为2的等比数列{$a_n$} 的各项都是正数，且 $a_3{a}_{11}=16$，则$a_5=$（      ）

下列关于内能的说法正确的是（     ）

    Bai Ling was happy yesterday. Because it was her father's birthday. She boughtgifts for him. And they took pictures in the park. In the afternoon, they ate delicious food. Bai Ling has a pen pal. He is Pat. He lives in the US. Yesterday he came here. He sang and danced. Oh, he also bought gifts. We had a good time.