— How did the accident ______? — The driver couldn’t see the road clearly because of the hea

题干

— How did the accident ______?

— The driver couldn’t see the road clearly because of the heavy rain. This is the main reason.

A：take place

B：suffer from

C：switch off

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A

This summer, Mary, Tom, Alan are going to have an ideal vacation .
The followings are their plans for the coming vacation .

	Mary	Tom	Alan
Where ?	The Great Wall	Spain	Canada
When?	The first week in June	The last day of the May	June, Monday 18^th
Who ?	His parents	His best friends	His cousin
What ?	Going hiking , Going sightseeing, Visiting some famous places in Beijing, Going shopping	Going sightseeing Going shopping Going camping Watching bull(牛)-fight	Spending time in the countryside , Renting videos at night , Going fishing , Going hiking, Sleeping a lot
How long?	About one month	Only two weeks	Until September
Transportation	By plane and by bus	By boat and by plane	By plane and by train

学习细菌知识后，小敏知道与动植物相比，细菌的细胞没有____．

他想“温度对细菌的繁殖速度有何影响？”

他提出假设：随着温度的升高，细菌的繁殖速度加快．

为了验证这一假设，他设计并进行实验，结果如表．

表中数据____（选填“支持”或“不支持”）他的假设．

他又猜想：“酸碱性可能会影响细菌的繁殖速度．”

他设计了除酸碱性不同外，其余条件均相同的甲、乙、丙三组实验，如图．则丙应控制成____性环境．

请提出一个与上述猜想不同的，可能会影响细菌繁殖速度的因素：____．