甘草gap种植基地建设项目可行性研究报告(编辑修改稿)

甘草gap种植基地建设项目可行性研究报告(编辑修改稿)内容摘要：

. O li ver: Wel , wel , wel l! But you’ve never had such a job before. H ow can i t be sure you can do i t successful y? H enry: Try m e… oh, do, I beg of you! Gi ve m e 30 or 40 years , and … O li ver: O h, wel, al l ri ght. N arrator: Are Porti a and H enry happy? There are not enough word i n the bi ggest di cti onary to descri be i t. Di d the peopl e of London have a good tim e wi th thi s bit of news? Yes. Portia’s stepfather took that bank note back to the Bank of Engl and and cashed it. The bank note was then usel es for m oney but was hi s weddi ng gift to the young coupl e. Yes, the bank note was worth m il li ons of dol ars, but not worth on tenthe as m uch as how H enry felt about Porti a . Uni t 4 H ow li fe began on the earth No one knows exactl y how the earth began, as i t happened so l ong ago. However, accordi ng to a wi del y accepted theory, the uni verse began wi th a “ Bi g Bang “ that threw m atter in al l directi ons. After that, atom s began to form and bing to create stars and other bodies. For several bil li on years after the “ Bi g Bang “, the earth was sti l just a cl oud of dust. What i t was to be e was uncertai n unti l between 4. 5 and 3. 8 bil li on years ago when the dust settl ed i nto a soli d gl obe. The earthenware becam e so vi ol ent that i t was not cl ear whether the shape woul d l ast or not. It expl oded l oudl y wi th fi re and rock. They were i n ti m e to produce carbon, ni trogen , water vapour and other gases , whi ch were to m ake the earth’s atm osphere. What i s even m ore i m prtant is that as the earth cool ed down, water began to appear on i ts surface. Water had al so appeared on other pl as l i ke Mars but, unl i ke the earth, i t had di sappeared l ater. It was not im medi atel y obvi ous that water was to be fundam ental to the developm ent of l i fe. What many sci enti sts bel ieve i s that the conti nued persence of water al l owed the earth to di sol ve harm ful gases and aci ds i nto the oceans and seas. Thi s produced a chai n reacti on, whi ch m ade i t possibl e for li fe to devel op. Many m il li ons of years later, the fi rst extrem el y sm al l pl ants began to appear on the surface of the water. They m ulti pl i ed and fil ed the oceans and seas wi th oxygen, whi ch encouraged the l ater devel opm ent of earl y shel l fi sh and al sorts of fi sh. N ext, green pl ants began to grow on l and. They were fol owed i n tim e by l and anim al s. Som e were i nsects. O thers, cal led am phi bi ans, were abl e to li ve on l and as wel l as i n the water. Later when the pl ants grew i nto forests, reptil es appeared for the fi rst ti m e. They produced young general ly by l ayi ng eggs. After that, som e huge anim al s, cal l ed di nosaurs, devel oped. They l ai d eggs too and exi sted on the earth for m ore than 140 m il li on years. H owever, 65 m il li on years ago the age of the di nosaurs ended. Why they suddenl y di sapeared sti l rem ai ns a m ystery. Thi s di sappearance made possi bl e thi ef ri se of m amm als on the earth. These anim als were different from al l ife forms i n the past, because they Gavi n bi rth to young baby anim al s and prodeced mi lk to feed them . Finnal y about 2. 6 mil li on years ago som e sm al l cel ver anim al s, now wi th hands and feet, apeared and spread al over the earth. Thus they have, i n thei r turn, be e the m ost i mportant anim als on the pl a. But they no they l ooki ng after the earth very wel l. They are putti ng too much carbon di oxi de i nto the atm osphere, whi ch prevenrs heat from escapi ng from the earth i nto space. As a result of thi s, m any sci enti sts beli eve the earth m ay b e too hot to l i ve on. So whether li fe wil l conti nue on the earth for mi l i ons of years to e wil l depend on whether thi s probl em can be sol ved. A vi si t to the m oon Last m onth I was l ucky engough to have a chance to make a tri p i nto space wi th m y fri end Li Yanpi ng, an astronom er. We vi si ted the m oon i n our spaceshi p! Before we l eave, Li Yanpi ng expl ai ned to m e that the forece of the gravi ty woul d change three ti mes on our journey and that the fi rst change woul d be the m ost powerful . Then we were off. As the rocket rose i nto the ai r, we were pushed back i nto our seats because we were tryi ng to escape the pul l of the earth’s gravi ty. It was so hard that we coul d not say anythi ng to each other. Gradual y the wei ght l esened and I was abl e to tal k to hi m. “ Why i s the spaceshi p not fal i ng back to the earth? O n the earth i f I fal from a tree I wi l fal to ground.” I asked. “ We are to far from the earth now to feel its pul , “ he expl ai ned, “ so we feel as i f there i s no gravi ty at al . When we get cl oser to the m oon, we shal feel its gravity pul i ng us, but i t wi l not be as strong a pul l as the earth’s. “ I cheered up imm edi atel y and floated wei ghtl essl y around in our spaceship cabi n watchi ng the earth bee sm al l er and the m on l arger. When we got there, I wanted to expl ore imm ediately. “ Com e on, ” I sai d. “ If you are right, m y m ass wil l be l es than on the earth because the m oon i s sm al l er and I wi l be abl e to m ove more freely. I mi ght even grow tal er i f I stay here l ong enough. I shal l certai nl y wei gh l ess!” I l aughed and clim bed down the steps from the spaceshi p. But when I tri ed to step forward, I found I was carri ed twi ce as far as on the earth and fel l over. “ O h dear, ” I cri ed, “ wal ki ng does need a bi t of practi ce now that gravity has changed.” After a whil e I got the hang of i t and we began to enjoy ourselves. Leavi ng the moon’s gravity was not as pai nful as l eavi ng the earth’s. But returni ng to the earth was very fri ghteni ng. We watched, am azed as fire broke out on the outsi de of the spaceshi p as the earth’s gravi ty i ncreased. Agai n we were pushed back hard i nto our seats a。