需求曲线向右上方倾斜的充分必要条件是( )。A．低档商品 B．替代效应大于收入效应

This is a big tree. I can   36  a girl under it. She   37  a student.   38  name is Kate Green. She is   39  American girl. Kate is   40  yellow trousers.   41  are very nice.   42  boy near Kate is her brother, Jim. Jim is   43  a green, orange and blue bike. His coat is blue and his shoes   44  white. Kate and Jim are good students. They are  45  the same(相同的) school.

小题1:	A．look B．watch C．read D．see

小题2:	A．has B．is C．looks D．are

小题3:	A．Her B．His C．My D．Its

小题4:	A．a B．an C．the D．/

小题5:	A．on B．with C．in D．/

小题6:	A．It B．She C．Their D．They

小题7:	A．The B．A C．An D．/

小题8:	A．in B．at C．on D．under

小题9:	A．is B．have C．has D．are

小题10:

A．in B．between C．on D．under