四级练习2013.02.05
[audio]http://sound.yywz123.com/tingbbs/cet4/cet420130205.mp3[/audio]M: Hi,Sue.Where have you been?
W: Oh.Hi,Dan.I was just at the library.I have to hand in my biology paper tomorrow.
M: Tomorrow? Oh, no,I thought it wasn't due till Monday.
W: Oh. Don't worry.(1)_________________________.
M: Oh, where are you going?
W: California.We're having a family reunion.It's my grandmother's ninetieth birthday.So, all the cousins and aunts and uncles are going.She planned the whole thing herself.
M: Wow. That's great.How many people will be there?
W: Around sixty.(2)_________________________.So, have you started working on your biology paper?
M: Yeah. I'm doing it on bees and how they're able to recognize whether another bee is related to them.
W: How can they tell?
M: They use their sense of smell.(3)_________________________.If it is,it's allowed to enter.
W: Interesting.Can other insects do this?
M: Well,the paper wasps can.Each wasp nest has a special combination of plant fibers and so the wasps that live there have a unique smell.Those two are only kind I've read about so far.
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