从人类的食性来看，我们所处的营养级是 ( )
A．第一、二级
B．第二、三级
C．第三、四级
D．第二、三、四级
参考答案：D
The social worker asked Daniel ______________.
A．if did he have any problem
B．who he played football with the day before
C．how long he usually spent on his homework
D．what he will do this summer
制定灌溉制度有什么意义？
