正确答案: A

根尖能够产生细胞分裂素 脱落酸能抑制马铃薯发芽 生长素的化学本质是蛋白质 赤霉素施用过多可引起水稻植株疯长

题目：下列关于植物激素的叙述，错误的是

解析：C

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举一反三的答案和解析：

[单选题]Had I known about this computer program, a huge amount of time and energy .

would have been saved

[单选题]现代裸子植物中最原始的类群是( )。

铁树纲

[单选题]与“桂之所产，古以名地”意思最接近的一项是_____________(2分)

因是桂的产地，古时就把桂作地名。

[单选题](D)The latest research suggests a more prosaic, democratic, even puritanical view of the world. The key factor separating geniuses from the merely accomplished is not a divine spark. It’s not I.Q., a generally bad predictor of success, even in realms like chess. Instead, it’s deliberate practice. Top performers spend more hours (many more hours) rigorously practicing their craft. If you wanted to picture how a typical genius might develop, you’d take a girl who possessed a slightly above average verbal ability. It wouldn’t have to be a big talent, just enough so that she might gain some sense of distinction. Then you would want her to meet, say, a novelist, who coincidentally shared some similar biographical traits. Maybe the writer was from the same town, had the same ethnic background, or, shared the same birthday.

the decisive factor in making a genius D． the way of gaining some sense of distinction

[单选题]有X、Y、Z、W、M五种短周期元素，其中X、Y、Z、W同周期， Z、M同主族； X+与M2－具有相同的电子层结构；离子半径：Z2－＞W－；Y的单质晶体熔点高、硬度大，是一种重要的半导体材料。下列说法中，正确的是

元素W和M的某些单质可作为水处理中的消毒剂

[单选题]密闭有空气的薄塑料瓶因降温而变扁，此过程中瓶内空气（不计分子势能）

内能减小，外界对其做功

解析：不计分子势能，空气内能由温度决定、随温度降低而减小，AC均错；薄塑料瓶因降温而变扁、空气体积减小，外界压缩空气做功，D对；空气内能减少、外界对空气做功，根据热力学第一定律可知空气向外界放热、B错。