题目内容
不仅同类M期细胞可以诱导PCC，不同类的M期细胞也可以诱导PCC产生。
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在酵母的研究中，与细胞分裂和周期调控有关的基因被称为 cdc基因。
不同周期蛋白的表达时期不同，与不同的CDK结合，调节不同CDK激酶的活性。
Fill in the gaps with words or phrases given in the box. Change the form where necessary.available go ahead keep in touchabsolutely urge estimate reunionhang out destination or something go by every now and then mostlyknow by heartright awayreference1) There was no wind and the oak tree behind the house was standing ______________ still.2) If you don’t want to buy a kite, you can make your own using directions _______________ in books at your local library.3) The girl walked steadily north, pausing _______________________ to check her direction.4) The trade unions ______________________ employers to invest more money in staff training.5) As a sailing ship has a ______________, so we must have a definite goal in our life.6) Before people knew how to make and use metals, engineering constructions were ___________ built of wood or stone.7) You’ll probably find Dave at the school disco — he often _________________ there.8) If your house has been broken into, don’t touch anything. Call the police _________________.9) We had a family ______________ where I saw relatives I hadn’t seen for 20 years.10) I guess Henry has been busy writing an article ________________ recently. That’s why he couldn’t accept the invitation.11) Scientists _____________ that smoking reduces life expectancy by around 12 years on average.12) Although it is unlikely that everyone will be able to come, they are still _________________ with the plan to hold a class reunion.
Complete the sentences, using the words or phrases in brackets. Make additions or changes where necessary.A couple of flights at Pudong airport 1._________________ this morning because of 2. _____________ weather. It 3. ______________ that over one thousand passengers were held up. (awful, postpone, estimate)My professor assigned me some 4. _____________ books on computer science to read. Unfortunately they are5. ________________ in our school library. I 6. ________________ worried about it. (available, kind of, reference)Michael is 7. ______________________ teacher. He often 8. ________ from one subject to another so it is difficult for his students to follow him. Besides he just lets them 9. _____________ with exercises without making sure they have understood what they are expected to do. (skip, go ahead, not much of a)
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