2022英语周报答案33

第一节One possible versionear Jona,Im glad to hear from you and I' d like to share wyou something about serving chopsticksServing chopsticks are mainly used to take food fromshared dishes. You can add food to your bowl with thembut never place them into your mouth or your own bowlUsing serving chopsticks can prevent diseases from sprea-ding while we are eating together. We can alsq use them toput food into others bowls, thus creating a pleasant andharmonious dining atmosphereHoping youll come to China to experience theem afirst handYoursUa

(1)维管束鞘细胞内的叶绿体基质(2分)玉米叶肉细胞内有“CO2泵”,在气孔因高温关闭时仍可以维持维管束鞘细胞内较高浓度的CO2,且此时光照增强,有可能使 NADPH和ATP生成增加(答案合理即可2分(2)光照强度(1分)降低(1分)8(1分)10(1分)3)水稻暗反应相关的酶活性比玉米的高(或水稻暗反应相关的酶数量比玉米的多)(2分)解析:(1)由题图可知,玉米植株消耗 NADPH的具体场所是维管朿鞘细胞内的叶绿体基质。在气孔因高温关闭时,由于玉米叶肉细胞内有“CO2泵”,其仍可以维持维管束鞘细胞内较高浓度的CO2,且此时光照增强, NADPH和ATP生成增加,因此玉米光合速率不会明显下降甚至可能会升高(3)玉米、水稻的光合速率变化与酶有关。随着胞间CO2浓度的升高,玉米的光合速率不再变化,而水稻的光合速率可以逐渐上升,原因可能是水稻暗反应相关的酶活性比玉米的高(或水稻暗反应相关的酶数量比玉米的多)。

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