Plants grow(生长) fast in spring 51 summer because the weather is 52 with 53 rain.When autumn comes the weather becomes 54 and dry（干燥）.Plants grow 55 in autumn.Some may even die（死亡） 56 winter comes ,but some plants 57 live in winter.In autumn their leaves（叶子） turn 58 and fall off.So they can lose 59 water through（通过） the leaves.When spring comes,60 leaves will grow out.
( C )51.A.or B.but C.and D.also
( C )52.A.cold B.warmer C.warm D.cool
( B )53.A.many B.plenty of C.a little of D.much
( B )54.A.hot B.cool C.cold D.warm
( A )55.A.slowly B.fast C.slow D.quick
( B )56.A.since B.before C.in front of D.behind
( D )57.A.yet B.too C.either D.still
( A )58.A.yellow B.green C.blue D.white
( C )59.A.few B.fewer C.little D.less
( C )60.A.few B.larger C.new D.old