素有“天府之国”美称的地区是( )
A:云贵高原
B:四川盆地
C:成都平原
D:长江中下游平原
阅读下列短文,从每小题的三个选项中选出最佳答案
It is morning now. Look at the sun, it rises in the east(东方). Look at the tree, the shadow is long. It is noon now. The sun is high in the sky. It is very hot. Look at the tree. The shadow is short. It is evening now. The sun goes down in the west(西方). Look at the tree, the shadow is long again. It is night now. The moon is high in the sky. There are some stars in the sky too.
(Ⅰ)求曲线C的普通方程及直线l的直角坐标方程;
(Ⅱ)设点P(0,﹣2),求|PA|+|PB|的值.
小丽患了佝偻病,她多喝牛奶的同时,还应该让她服用 ( )。
①“限制”意味着人类必须遵循规律并且按客观规律办事
②“自由”表明人们可以随心所欲地认识和利用客观规律
③充分发挥主观能动性还需要善于排除客观规律这个障碍
④“统一”表现在人能改变规律发生作用的条件造福人类
植物体内形成ATP的过程有( )①光反应 ②无氧呼吸由丙酮酸产生乳酸的过程③暗反应 ④无氧呼吸由丙酮酸产生酒精的过程⑤有氧呼吸的过程 ⑥无氧呼吸产生丙酮酸的过程