橙皮素具有抗氧化、消炎、降血脂、保护心血管和抗肿瘤等多种功效。它的合成路线如下：

根据短文内容和首字母提示，在下文空格处填入适当的词使短文完整。（每空一词）

I’d like to tell you about Halloween. People in the USA c___小题1:___ it on the evening of October 31st. On that day, children like to p___小题2:___ a game called “trick or t__小题3:___”. They knock on p___小题4:__ doors and shout “trick or treat”. If people don’t give them a___小题5:___ candies, they can play a trick o___小题6:____ them. Usually they w___小题7:___ masks or paint their faces. People don’t know who they are. Another i____小题8:___ thing is to make pumpkin lanterns. On the evening of that day, families always have a s____小题9:___ party. People can e___小题10:___ hot drinks and lots of nice hot food. It’s really wonderful.

原始大气可能形成许多简单有机物的自然条件是（　　）

A．高温、紫外线、雷电

B．适宜的温度、可见光、雷电

C．低温、火山喷发放出的光

D．自然火源、水、二氧化碳

通常不能控制排尿，尿液均从 * * 流出，亚甲蓝试验见到有蓝色液体经 * * 壁小孔溢出为（）

A.膀胱 * * 瘘

B. * * * * 瘘

C.输尿管 * * 瘘

D.直肠 * * 瘘

E.膀胱宫颈瘘

一根内径为0.1m的钢管损坏，需要更换，现只有内径为0.05m的钢管，要使两根管子的流速流量相等，应用（）根管。

A.8

B.6

C.4

D.2

短日植物