题目内容

___________, Geoffrey's illness proved not to be as serious as we had feared.

A. To our relief
B. To our regret
C. To our sadness
D. To our satisfaction

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He was so curious to know what was in the letter that he could not _____ himself _ opening it.

A. protect... from...
B. prevent... from...
C. restrain...from...
D. restrict...from...

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A. 地形因子
B. 植物因子
C. 动物因子
D. 人为因子

植物通过暗反应固定二氧化碳的途径主要有

A. C3途径
B. C4途径
C. 光合磷酸化
D. 景天酸代谢途径

当冻害发生时，植物会受到以下哪些影响

A. 酶活性降低
B. 蛋白质变性
C. 细胞质过度脱水
D. 机械伤害