【文章內(nèi)容簡介】 e”. Som eone watchi ng m e woul d have seen the spaceshi p flyi ng li ke a bi rd away from the “bl ack hol e”. But we fel t nothi ng. At l ast we were abl e to l ook around us. Luckil y the puter had started worki ng agai n. We real i zed that we had di scovered som ethi ng new about “black hol e”. If you go i nsi de the edge of a “black hol e”, i t wil l “eat” you and there i s no escape。 but i f you do not, you m ay have an opportuni ty to escape. H ow exciti ng! Unit 5 A tri p on “ The True North” Li Dai yu and her cousin Li u Qian were on a tri p to Canada to bi si t their cousi ns i n Montreal on the Atl anti c coast. Rather than take the aeropl ane al the way, they deci ded to fl y to Vancouver and then take the trai n west to east acros Canada. The though that they coul d cross the whol e continent was exci ti ng. Thei r fri end, Danny Li n, was waiti ng at the ai rport. H e was goi ng to take them and thei r baggage to catch “The True N orth”, the cross Canada train. O n the way to the stati on, he chated about thei r tri p. “You ’re goi ng to see som e great scenery. Goi ng eastward, you’l l pass m ountai ns and thousands of l akes and forests, as wel as wi de ri vers and large ci ti es. Som e people have the i dea that you can cross Canda i n l ess than fi ce days, but they fet the fact that Canada i s 5500 ki lom eters from coast to coast. H ere i n Vancouver, you’re i n Canada’s warm est part. Peopl e say it i s Canada’s m ost beauti ful ci ty, surrounded by m ountai ns and the Paci fi c O cean. Ski i ng i n the Rocky Mountai ns and sail ing i n the harbour m ake Vancouver one of Canada’s m ost popul ar ci ti es to l i ve i n. Its popul ati on i s i ncreasi ng rapi dl y. The coast north of Vancouver has som e of the ol dest and m ost beautiful forests i n the worl d. It i s so wet there that the trees are extrem ely tal l, som e m easuri ng over 90 m etres. ” That afternoon aboard the trai n, the cousins settl ed down i n thei r seats. Earli er that day, when they crossed the Rocky Mountai ns, they m anaged to catch si ght of som e m ountain goats and even a gri zzly bear and an eagl e. Their next stop was Cal gary, whi ch i s fam ous for the Cal gary Stam pede. Cowboys from al over the worl d e to pete i n the Stam pede. Many of them have a gi ft for ri di ng wi l d horses and can win thousands of dol ars i n pri zes. After two days’ travel, the gi rls began to real ize that Canada i s quite em pty. At school, they had l earned that m ost Canadi ans li ve wi thi n a few hundred kil om etres of the USA border, and Canada’s popul ati on i s onl y sli ghtl y over thi rty m il i on, but now they were amazed to se such an em pty country. They went through a wheatgrowi ng provi nce and saw farm s that covered thousands of acres. Afrer di ner, they were back i n an urban area, the busy port ci ty of Thunder Bay at the top of the Great Lakes. Because of the Great Lakes, they l earned, Canada has m ore fresh water than any other country in the worl d. In fact, i t has onethi rd of the worl d’s total fresh water, and much of i t i s i n the Great Lakes. That ni ght as they sl ept, the trai n rushed across the top of Lake Superi or, through the great forests and southward towads Toronto. “The True North” from Toronto to Montreal The next m orning the bushes and m apl e trees outsi de thei r wi ndow were red, gol d and orange, and there was frost on the ground, confi rmi ng that fal l had arri ved i n Canada. Around noon they ari ved in Toronto, the bi gest and m ost weal thy city i n Canada. They were not l eavi ng for Montreal until l ater, so they went on a tour of the ci ty. They went up the tal CN Tower and l ooked acros the l ake. In the di stance, they coul d see the Mi sty cl oud that rose from the great N i agara Fal s, whi ch is on the south si de of the l ake. The water fl ows into the N iagara Ri ver and over the fal ls on its way to the sea. They saw the covered stadi um , hom e of several fam ous basketbal team s. As they wal ked north from the harbour area, Li Dai yu sai d, “Li n Fang, one of m y mother’s ol d school mates, lives here. I should phone her from a tel ephone booth. ” They met Lin Fei around dusk i n downtown Chinatown, one of the three i n Toronto. O ver dinner at a restaurant cal ed The Pink Pearl, the cousins chatted wi th Lin Fei, who had moved to Canada m any years earli er. “We can get good Cantonese food here,” Li n Feitold them, “ because most of the Chi nese peopl e here e from South Chi na, especial y H ong Kong. It’s too bad you can’t go as far as Ottawa, Canada’s capi tal . It’s approxi matel y four hundred kil ometers northeast of Toronto, so it woul d take too l ong. ” The train left late that ni ght and arrived i n Montreal 1第一部分：我們的使命 第一章 健康、疾病與藥品 在日常生活中，當(dāng)身體出現(xiàn)發(fā)燒、頭痛等癥狀時，說明我們生病了，身體不再健康。受到了疾病的困擾，必須采取辦法治療疾病。俗語說得好“生病吃藥，藥到病除”，所以，治療疾病的辦法就是對癥下藥。 《辭?！穼】档亩x：人體各器官系統(tǒng)發(fā)育良好、功能正常、體質(zhì)健壯、精力充沛，并具有健全的身心和社會適應(yīng)能力的狀態(tài)。通常用人體測量、體格檢查和各種生理和心理指標(biāo)來衡量。 《辭?！穼膊〉亩x：指人體在一定條件下，由致病因素所引起的一種復(fù)雜而有一定表現(xiàn)形式的病理過程。此時，在不同程 度上，人體正常生理過程遭到破壞，表現(xiàn)為對外環(huán)境變化的適應(yīng)能力降低、勞動力受到限制或喪失，并出現(xiàn)一系列臨床癥狀。疾病是致病因素對人體的損害和人體對抗這些損害的防御、代償?shù)茸饔玫拿?。這一矛盾的雙方，在整個疾病過程中不斷進行斗爭，直到疾病痊愈或人體死亡時才告終結(jié)。 由此可見，藥品在維護我們的身體健康中起著不可替代的作用。我們身體一旦受到疾病的侵擾，都必須使用藥品予以調(diào)節(jié)或治療，才能恢復(fù)健康。大家想想，如果沒有藥品，當(dāng)受到病患的侵擾時，我們將無力與疾病抗?fàn)?，任由病魔肆虐，疾病將奪去我們的健康甚至生命。 因此，健康 離不開藥品，我們的生活離不開藥品。 第二章 認識藥品 a chance to make a tri p i nto space wi th m y friend Li Yanpi ng, an astronom er. We vi si ted the m oon i n our spaceshi p! Before we l eave, Li Yanping expl ai ned to m e that the forece of the gravi ty woul d change three ti m es 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 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 gh