找出每组单词中不同类的一个。
( )（1）A. skating B. basketball C. rowing.
( )（2）A. mother B.sister C.man
( )（3）A. computer B.knife C.stapler
( )（4）A.car B.park C. cinema
( )（5）A.piano B.baseball C.accordion
The tree _________ are green in spring.
A.leafsB.leavesC.leaf
They _______ the insects carefully.
A.watching B.are watchingC.is watching
---When do you watch TV?
---I usually watch TV ______ seven o’clock.
A.inB.onC.at
I am ________ a picture.
A.drawB.drawingC.draws
找出与其他不同类的一项，并把序号填入括号内。（每小题2分，共10分）（）
| A．spring | B．season | C．summer | D．fall |
（）
| A．what | B．when | C．week | D．where |
（）
| A．hot | B．cold | C．weather | D．warm |
（）
| A．eating | B．swimming | C．swing | D．climbing |
（）
| A．writing | B．doing | C．playing | D．fighting |