托福写作</p> integrated writing& d! w; q, s& R3 n& B X/ X
说北美的corn受到rootworm的侵害,阅读想出了几个办法
. ^5 }% w6 Y5 Y5 Q+ p 1.用Pesticide
7 Q" N) c' S. `8 U! p, q6 U 2.早点种玉米(plant the corn earlier in the year), 这样等天气暖和后,corn的根就mature了,rootworm的Larvae就吃不成它的根了, x: k0 D9 J6 U! i0 l
3.换着种(alternative),今年种玉米,明年种别的作物(crop),像有些farmer会corn和roy换着种,这样在种roy的时候,rootwarm的幼虫饿死后,就不会再去吃玉米了
$ W: {# y8 s8 R+ \ 托福听力3 [& }8 j( Y p4 j* ^
professor反对说all methods have severe limitations
4 J- ^$ _3 a- e/ m* ~. X- s, ] 1.有些rootwarm对pesticide产生了resistance
; L6 `, E( c4 ^0 c- v1 U, [5 I 2.早点种的坏处是,corn会遇到frosts和snowstorms' R( ]! [. i3 h( V
3.rootwarm已经adapt了这种换着种的方法,所以它们evolve出了一种egg,可以在土里买上几年在hatch,这样等它们hatch就可以吃到玉米根了9 H/ \0 N. S# |# @2 N, G7 d0 L
independent writing1 R; G& C6 G7 h4 P0 C- k. |
Do you think it is better for government to spend money on building furture housing or preserving historic or traditional buildings and homes?
4 H( e8 d; D7 A, ]2 v; v( Q 就只能回忆这么多了,请见谅!谢谢!希望对大家有帮助 |