Every year animals all around the world take part in some wonderful journeys．Here are the stories of two amazing animal travelers．
Humpback whales （ 座 头 鲸 ） prefer a slow journey．The humpbacks，
which travel over 10，000 kilometers on their journey from Alaska to Hawaii，swim at a relaxing speed of
about 1.6 kilometers an hour．Although they don't swim fast，humpback whales travel farther than any other kinds of whale．
Every August a fantastic sight can be seen in the skies above Ontario and Montreal﹣﹣millions of amazing
Monarch butterflies （ 帝 王 蝶） beginning their 4，000﹣﹣kilometer journey from Canada to Central Mexico．In fact，the journey，
which takes about 3 months，is longer than the average （ 平 均 的 ） life of the butterfly．Finally many
of the butterflies reaching their final place are the great grandchildren or even the great great grandchildren of the butterflies who began the journey in Mexico the year before．
任务一根据文章内容，完成下列句子．（每空不超过3个单词）
Humpback whales swim at a speed of （1） an hour from Alaska to （2） ．They travel slowly but （3） among all whales．Monarch butterflies spend（4） flying from Canada to Central Mexico．It lasts longer than their average life．The ones which arrive at the final place are （5） or even the great great grandchildren．
任务二请用英语简要概括出本文的主旨大意，不超过10个单词．
The passage is mainly about ．
because，robots，over，recycle，or，dangerous，our，and，forever，safe，cars，run
What will our world be like in 2050？We asked a group of experts to make their predictions about our future．
By 2050 we will have"clever"（1） .We won't have so many accidents,（2） they will be able to communicate with each other.Cars will slow down by themselves or stop in（3） situations．Also，our cars will（4） on electricity or water．
By 2050 our homes will be more eco﹣friendly（环保）．We will use solar（太阳的）energy，and we will clean and（5） our water.There will be many more people in the world（6） our houses will be smaller．Many houses will be underground and we will have （7） to help clean，cook and do （8） home shopping．
We won't die!We will put our brains onto computers and live （9） ．The computers of the future won't look like machines．They'll look like humans．
By 2050 there will be too many people on the earth and （10） 100 million people will be living on the moon and other planets．We will be able to travel to Mars and back in just three days．
After doing sports for a long time，Tina is （瘦的） than before．
The exam is very important to us，so we must take it （严肃地）．
People in some countries eat many （土豆） as their main food．