Plants are very important living things.Life could not go on if there were no plants.This is 16　 plants can make food from air,water and sunlight日光.Animals and men 17 make food from air,water and sunlight.Animals get their food by eating plants and animals,　 18 .Therefore(因此),animals and men need plants in order to 19 .This is the reason why we find that there are so many plants around us.

　 If you look carefully at the plants around,you 20 find that there are many kinds of plants. Some plants are large 21 others are small.Most plants are green.

　 Some plants have many small leaves.Others have only 22 large leaves.There are many kinds of leaves.Leaves are of 23 shapes(形状) and colours.

Leaves are also different in other ways.Some leaves have short leaf stalks(叶茎)while others have long leaf stalks.Still others have 24　 stalks at all.The edges(边)of leaves are also different. Some leaves have smooth(光滑的)edges.Some have wave(波状的)edges 25 the teeth of saw(锯).

( )1.　　　　　　 A.why　　　　　 B.because　　 　 C.how　　　　 D.that

( )2.　　　　　　 A.don’t　　　　 B.not　　　　 　　 C.cannot　　　 D.can

( )3.　　　　　　 A.too　　　　　 B.either　　　 C.also　　　　 D.already

( )4.　　　　　　 A.eat　　　　　 B.live　　　　 C.have 　　　 D.get

( )5.　　　　　　 A.are going to　 B.may　　　　 C.certainly　　 　　　 D.will

( )6.　　　　　　 A.when　　　　 B.yet　　　　　 C.and　　　　 D.while

( )7.　　　　　　 A.a little　　　　 B.a few　　　 C.little　　　　 D.few

( )8.　　　　　　 A.much　　　　 B.different　　 C.same　　　　 D.the same

( )9.　　　　　　 A.not　　　 　　B.none　　　　 C.neither　　　 D.no

( )10. A.like　　　　　 B.as　　　　　 C.as if　　　　 　 D.seem