题目内容

对生物产生一定影响的环境因子称为生态因子，包括气候、土壤、生物、人为因子等。()

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？Read this part of a fax from Susan Carter, a hotel conference manager.
To:
Fax No:
From: Susan Carter
Date: 1 March 2009
Pages (incl cover) : 3
Thank you very much for your letter. I note your request for a special menu for the conference dinner. You will find suggestions enclosed.
Unluckily, during the week you have chosen for your conference, there is a sports meeting. Therefore, we have very few single rooms available. But I could offer you twin-bedded rooms, or perhaps you would consider moving your conference to the following week？
I look forward to receiving your booking and choice of dishes for the conference dinner.
？Write a fax to Mrs Carter:
？thanking her for her fax
？confirming your original dates for the conference
？booking 30 twin-bedded rooms
？telling her which dishes from the menu you require for the conference dinner.
？Write 60-80 words .
？Do not include any postal addresses.

当氮素不足时，即使二氧化碳浓度升高，植物的产出也不一定升高。()

随着南北极臭氧层空洞加剧，南北极的紫外线的总量已经远远高于低纬度地区。()

研究表明，在水分供应出现紧张时，植物对于二氧化碳浓度升高表现的正效应更大。()