2018-2022第49期英语周报答案

19.C【解析】该植株在b点开始进行光合作用,A项错误;曲线de段下降的原因是温度过高蒸腾作用过强,气孔关闭导致二氧化碳吸收减少,段下降的原因主要是光照强度下降,B项错误;该植株c点g点时,光合速率大于呼吸速率在g点有机物积累量最多,C项正确;该植株增加的质量来自于水、矿质元素和二氧化碳,D项错误。

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

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