植物对高原生态环境适应方式是（ ）

【名词&注释】

光合作用、门静脉(portal vein)、叶绿体(chloroplast)、生活方式(life style)、肺静脉(pulmonary vein)、助动词(auxiliary verb)、动名词(gerund)、半小时(half an hour)、事实上(in fact)

[单选题]植物对高原生态环境适应方式是（ ）

A. 形成CO2的储库
B. 光合作用量子效率升高
C. 细胞内叶绿体大、数量少
D. 气孔导度减小、数目增多

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学习资料：

[单选题]As a matter of fact, our life-styles are changing _________and our bodies.

A. as such
B. so such
C. such as
D. so are

[单选题]

A. joinB． together
B. individual
C. joint

[单选题]We can infer that the students are required to ______in their whole driving practice.

A. go out driving for twelve times
B. spend at least six hours driving
C. drive for two hour blocks of time
D. get half an hour driving

[单选题]This passage suggests that not getting enough sleep might make you ______.

A. dream more often
B. have poor health
C. nervous
D. breathe quickly

[单选题]含动脉血的静脉是 （ ）

A. 上腔静脉
B. 头静脉
C. 板障静脉
D. 肺静脉
E. 门静脉

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