互补输出级采用共集形式是为了使（）。A．电压放大倍数大 B．不失真输出电压大 C．带

Have you ever planted a few trees on Tree Planting Day? Each year, millions of people, both 41.______, plant a lot of trees. But this may not be the best way to make your home a 42._____ place.
Last week we visited a park in Hebei. We were 43._____ to find most of the trees had been burned. The workers told us that the trees 44._____ soon after they were planted because they weren’t watered well enough. 45._____ workers burned them and cleaned the place for 46._____ trees to be planted this year. 47.______ a card found in one of the dead trees, a student wrote,” I hope this tree will grow up with me to 48.______ the backbone (栋梁) of our country.” The workers said that the survival (存活) of the trees was really more important than 49.______ trees were planted.
Some people in Beijing now have a new idea that they can donate (捐赠) some money and let professional (专业人士) plant and 50.______ the trees.

小题1:	A．students and teachers B．old and young C．boys and girls D．mother and father

小题2:	A．smaller B．colder C．warmer D．larger

小题3:	A．pleased B．happy C．interesting D．surprised

小题4:	A．died B．grew C．bought D．planted

小题5:	A．Though B．When C．Because D．So

小题6:	A．few B．old C．new D．dead

小题7:	A．Over B．From C．On D．About

小题8:	A．need B．hold C．plant D．be

小题9:	A．how many B．when C．how soon D．why

小题10:

A．take out B．take down C．take up D．take care of