题目内容

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。()

查看答案

搜索结果不匹配？点我反馈

更多问题

如果气孔导度随二氧化碳浓度的升高而降低，而光合速率提高的话，植物的水分利用效率必然增加。()

TASK TWO—EXPERIENCE
？For questions 18—22, match the extracts with the experience, listed A—H.
？For each extract, choose the experience stated.
？Write one letter (A—H) next to the number of the extract.
A I worked as a detective in a hotel.
B I passed the saving on to my customer.
C I helped customers to solve personal problems.
D I bought rubber cement in a hardware store.
E I worked as a clerk in a hardware store.
F Advertised featured customer-service should satisfy different needs.
G I handled complaint.
H I sold the product to customer with little discount.

根据现阶段研究，二氧化碳浓度的升高可能导致农作物减产。()

生态学是研究生物受到其周围环境影响后如何改变的科学。()