2019-2020年高中英语 Unit 2 Cloning 视听说选修课 Listening for details练习 新人教版选修8.doc

2019-2020年高中英语 Unit 2 Cloning 视听说选修课 Listening for details练习 新人教版选修8 Well, now, why dont you all sit down? Uh, Donald, sit down, sit down. Ah, here. Here he _. Well, here I e. Hello, hello. Say hello. Say hello. Hello. H- Hello. Hello, John. Oh, yes, Ive got lines here. Well, fine, fine, I guess. But _ did I get here? Uh, uh, well, let me _ you. First Ill need a _, your blood. Right. Ooh! John, that _. Relax, John, its all part of the _ of _. Hello, John. Hello, John. Hello. Cloned from what? Loy extraction has _ recreated an intact D.N.A. strand. Not without massive sequence gaps. Paleo-D.N.A. from what source? Where do you get a 100-million-year-old _ blood? Shhh! What? What? Oh, well, Mr. D.N.A.! Where did you e from? From your blood. Just one drop of your blood _ billions of strands of D.N.A., the building blocks of _. A D.N.A. strand _ me is a blueprint for building a living thing. And sometimes, animals that went _ millions of years ago, like dinosaurs, left their blueprints behind for us to _. We just had to know where to look. _ million years ago, there were mosquitoes, just like today. And just like today, they _ the blood of animals, even dinosaurs. Sometimes, after _ a dinosaur, the mosquito would _ on the branch of a tree and get stuck in the sap (树液). After a long time, the tree sap would get hard and _ fossilized, just like a dinosaur bone, _ the mosquito _. This fossilized tree sap, which we call _, _ millions of years with the mosquito inside. Until Jurassic Park scientists came along. _ sophisticated techniques, they extract the preserved blood from the mosquito, and bingo.: dino D.N.A. A full D.N.A. strand contains three _ genetic codes. If we looked at screens like these once a second for _ hours a day, itd take two years to look at the _ D.N.A. strand. Its that _. Since its so old, its full of _. Now thats where our geneticists take over. Thinking machine super-puters and gene sequencers _ the strand in minutes. And virtual-reality displays show our geneticists the _ in the D.N.A. sequence. We use the _ D.N.A. of a frog to _ the holes . and plete the code. Phew! And now, we can make a _ dinosaur. This score is only temporary. It all has very dramatic _, of course. Rum-pum-pum! A march or something. It hasnt been written yet. And then, of course, the tour _ on.