生长百年的老树,仍能不断生长,主要是因为有 A.输导组织 B.分生组织 C.保护

题型:选择题

问题:

生长百年的老树,仍能不断生长,主要是因为有

A.输导组织

B.分生组织

C.保护组织

D.营养组织

考点:植物体的结构层次关系植物的器官植物的组织
题型:选择题

一条肽链的分子式为C22H34O13N6,其水解后 * * 生了下 * * 种氨基酸:

据此判断,下列有关叙述错误的是[ ]

A.1个C22H34O13N6分子水解后可以产生3个谷氨酸

B.合成1个C22H34O13N6分子同时将产生5个水分子

C.1个C22H34O13N6分子中存在1个游离的氨基和3个游离的羧基

D.在细胞中合成1个C22H34O13N6分子至少需要3种tRNA

题型:选择题

(2006年江苏高考题)今有2个红球、3个黄球、4个白球,同 * * 不加以区分,将这9个球排成一列,有______种不同方法.(用数字作答)

题型:选择题

阅读表达(共5小题;每小题3分,满分15分)

阅读下面短文,并根据短文后的要求答题(请注意问题后的字数要求)。

(1) Hello. It’s one of the first words we learn as babies, yet it’s one of the last ones we think to use as adults. That’s unfortunate, because saying hello is more than just saying hello—it is recognition of another’s worth. How might the world change—how might we change—if we mastered this word? To find out, I spent one month saying hello to every person I met. Here’s what I’ve learned. 

(2) It can boost (促进) productivity. In one of the few studies ever done on this subject, Allan

Allday, an assistant professor of special education at Oklahoma State University, had middle school teachers greet their students individually each morning. This exchange of greetings raised the kids’ productivity. School went from impersonal to personal, and that resulted in more class participation and better grades. 

(3) Environments influence friendliness, One study found that people in the city were kiss likely to one hands with a stranger than those in the countryside. And researchers say, pleasure environments generally encourage more smiles and hellos than unpleasant ones. My experience was similarly. Whatever the reason, my urban hellos were answered far less often than my rural one. Similarly, people in vacation spots, like the Jersey Shore, were far friendlier than those hurrying work downtown. 

(4) It’s a form of universal health insurance. It’s impossible to say hello without smiling. And smiling has been shown to lower blood pressure, relieve stress and boost happiness. Apparently, a smile creates a similar effect in the recipient (接受者)。

(5)So maybe we can make the world a better place by____________. After a month of doing it. I feel lighter and more connected and I have a better sense of well-being. 

小题1:What does the author say about the adults according to Paragraph 1? (within 8 words)

_________________________________________________________________________

小题2:Which sentence in the text is the closest in meaning to the following one?

Teachers and students got friendlier so that the students became more active in learning and scored higher in tests. 

____________________________________________________________________________

小题3:Fill in the blank in Paragraph 5 with proper words. (within 5 words)

小题4:List three effects of smiling on health according to the text. (within 8 words)

①                         ②                     ③

小题5:Translate the underlined sentence in Paragraph 3 Chinese. 

题型:选择题

无限分布滞后模型

题型:选择题

混凝土输送泵的主要技术参数是()

A.功率Kw

B.搅拌筒转速r/min

C.集料最大粒径mm

D.搅拌输送量m3/h

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