【正文】 d 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 my m other’s old schoolm ates, li ves here. I shoul d phone her from a telephone booth. ” They m et Li n Fei around dusk i n downtown Chi natown, one of the three i n Toronto. O ver di nner at a restaurant cal ed The Pi nk Pearl, the cousins chatted wi th Lin Fei , who had m oved to Canada m any years earl i er. “We can get good Cantonese food here, ” Lin Fei tol d them, “ because m ost of the Chinese peopl e here e from South Chi na, especi al l y H ong Kong. It’s too bad you can’t go as far as Ottawa, Canada’s capi tal . It’s approxim atel y four hundred kil om eters northeast of Toronto, so i t woul d take too l ong. ” The trai n l eft l ate that ni ght and arri ved i n Montreal at dawn the next morning. At the station, peopl e everywhere were speaki ng French. There were sighs and ads i n French, but som e of them had Engli sh words i n smal er l eters. “We don39。s too bad,” he sai d. “Montreal is a city wi th wonderful restaurants and cl ubs. Most of us speak both Engli sh and French, but the city has French cul ture and traditi ons. We l ove good coffee, good bread and good music.” That night as the transfer was speeding al ong 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 moon 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 tim es on our journey and that the fi rst change would 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 l y the wei ght l essened and I was abl e to tal k to him . “ Why i s the spaceshi p not fal li ng back to the earth? O n the earth if I fal l from a tre I wil l fal to ground. ” I asked. “ We are too far from the earth now to feel i ts pul , “ he expl ai ned, “ so we feel as i f there is no gravi ty at al l. When we get cl oser to the m oon, we shal l feel i ts gravi ty pul ing us, but it 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 spaceshi p cabi n watchi ng the earth be e sm al l er and the m oon l arger. When we got there, I wanted to expl ore im m edi atel y. “ Com e on,” I sai d. “ If you are ri ght, m y m ass wil l be l ess than on the earth because the m oon i s sm al 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 certai nly 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, “ walki ng does need a bi t of practi ce now that gravi ty has changed. ” After a whi l e I got the hang of i t and we began to enjoy oursel ves. Leavi ng the m oon’s gravi ty 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, amazed as fi re 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 as we cam e back to l and. “ That was very exhausti ng but very exci ting to,” I sai d. “N ow I know m uch m ore about gravi ty! Do you thi nk we coul d bi si t som e stars next tim e?” “O f course, ” he smi led, “ whi ch star woul d you l i ke to go to?” Caught by a bl ack hol e The spaceshi p warned Li Yanpi ng and m e to be ready as we were approachi ng the “bl ack hol e”. We could see som e faint l i ghts around what l ooked l i ke an em pty space. Li Yanpi ng sai d, “ That em pty hol e i s li ke a m outh al ways needi ng to be fed. Those li ghts are thi ns that are bei ng pul l ed into tim e by the gravi ty of the hole. ” We watched with i nterest and am azem ent at the li ghts whi ch seem ed to be goi ng fainter and fai nter round the edge of the bl ack hol e. Just then the l ights on our spaceshi p went our the and the puter stoped worki ng. What was hapeni ng? I tri ed to turn the spaceshi p away from the hol e but it woul d not m ove. Woul d i t eat us to? Suddenl y the spaceshi p jum ped and began to m ove round the edge of trhe hol e too. The gravi ty of the “bl ack hol e” was pul i ng us into i ts “m outh”. As the spaceshi p m oved round the black hol e, I fel t rather sick. My m outh went dry and I closed m y eyes. Al l the stori es about what happened when you were caught by the gravi ty of a “bl ack hol e” seem to be true. But then the spaceshi p jum ped agai n. Thi s tim e i t moved si deways and away from thi s edge of the “bl ack hol e”. Som eone watchi ng m e woul d have seen the spaceshi p fl yi ng l i 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 again. We reali zed that we had di scovered som ethi ng new about “black hol e”. If you go i nsi de the edge of a “bl ack hol e”, i t wi l “eat” you and there is no escape。t l eave unti l this eveni ng, ” sai d Li u Qi an. “Let ’s go downtown. Ol d Montreal i s cl ose to the water.” They spent the afternoon i n l ovely shops and vi si