补全对话（共5分）
从方框中选出适当的句子，完成对话，有两项为多余选项。
| A：Would you like to go with us? B：How often do you go to the movies? C：Do you usually go to the movies? D：You’re welcome. E：Have a good time with your friend! F：What’s your favorite movie? G：What do you usually do on weekends? |
A：Tomorrow is Sunday.
B：I usually go to movies. What about you?
A：Me too.
B：Once a week.
A：
B：It’s hard to say. But I like American movies.
A：Who do you usually go to movies with?
B：My friend, Sally.
A：Are you going to the movies this weekend?
B：Sure.
A：I’d love to, but I have to look after my little sister this weekend.
B：Thank you.
Do you have a tail？ Of course not， we know． But tails are like opinions． actually， everyone has them： fishes， birds， most reptiles， and even some of our closest relatives．
Since tails first evolved（进化） at least 500 million years ago． Geckos （壁虎）use them to store fat， birds use them to steer through the air． But for most mammals （哺乳动物），（1） Yet， as you get closer to humans on the evolutionary tree， tails disappear， Gorillas（大猩猩）don' t have them， and neither do chimps（黑猩猩） or any other apes （类人猿）， including us， of course． To understand why， take a look at how we walk．
（2） walking like this gives us a huge advantage because unlike four﹣legged animals，which have to pour energy into every step they take， two legs take advantage of gravity（重力），which does some of the work for us． You see， each time we take a step， gravity pulls us forward．The end result is that when we walk， we use around 25% less energy than walking on all fours， and this way of getting around also totally eliminates（淘汰） the need for a tail．
It's said that you can still see a reminder of a time when our ancient ancestors had one． Just look at a human spine（脊椎）．（3） That's your tailbone． It's all that's the rest of our tail．
Now， babies are born with what looks like a tail， but that's not what's really going on． Most often， these tails are actually a parasitic twin（寄生物）． These types of tails usually form as a birth defect（瑕疵）．（4）
So the tail of humans has gone， it's the result of evolution millions of years Will humans be much taller， stronger or smarter in the future？
| A． Nowadays， humans can walk completely upright． B． And in these situations， doctors will advise to remove the tails with no harm to the babies． C． they serve one major purpose﹣﹣balance． D． You can see how the last few bones are partly fused（融合） together． |
为了实现中国梦，我们必须努力学习和工作．
to achieve our Chinese Dream， we must study and work hard．
在科学家们的努力下，中国已经能够制造像 C919 这样的大飞机．
With scientists' great efforts， China has to make big planes like C919．
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