下列关于小农经济条件下农民的表述,正确的有( )①拥有一定的土地和农具等生产资料 ②经营规模小、生产条件简陋③生产的产品主要用于交换 ④生产自己需要的农产品和手工制品
A:①②③
B:②③④
C:①②④
D:①③④
This boy is Peter .He is from America.He is ten years old . His hair is yellow.Peter can play basketball. This is his school.It's very big. There are forty students in his class. Miss White is his English teacher. Peter is good at English.
有五种化合物,它们两两之间发生的某些转化关系如图箭头所示.请回答:
(1)Na2SO4→NaCl的转化反应属于反应____ (填基本反应类型);这一类型反应能发生必须具备的条件之一是____(填一种).
(2)写出下列转化的化学方程式:
NaOH→Na2SO4____ ;
NaCl→NaNO3____ .
和青蛙相比,鸟的成活率高.主要原因包括( )
①体内受精 ②卵生 ③体外受精 ④卵外有卵壳保护 ⑤亲鸟有孵卵育雏行为 ⑥胎生.