—____ bike is this? —I think it’s Sally’

快乐是什么?精神病学专家通过实验发现：在大脑的相应部位-“奖赏中心”，给予柔和的电击，便会处于似乎极度快乐的状态。人们已经将“奖赏中心”各部分的脑电图绘制出来，并认为， 在各区域之间传递信息的化学物质是多巴胺，所以“奖赏中心”又称多巴胺系统。多巴胺结构如下图

（1）多巴胺的分子式：________________

（2）试判断多巴胺能发生的化学反应______________

A、加成 B、取代 C、氧化 D、水解

（3）写出符合下列条件的多巴胺的所有同分异构体的结构简式：__________________

①属于1，3，5三取代苯；

②苯环上直接连有一个羟基和一个氨基；

③分别能与钠的氢氧化钠反应，消耗钠与氧化钠的物质的量之比为2：1．

多巴胺可有香兰素与硝基甲烷缩合，再经锌苯还原水解而得。合成过程示如下

（4）写出下列反应类型：反应①_____________, 反应②_____________。

（5）A的结构简式_________________；

（6）写出②、⑤两步的化学方程式：

②：_____________________________⑤：________________________________

通货紧缩表明社会总供求关系是（）

A.有效需求过剩

B.有效需求不足

C.货币供给过多

D.商品供给不足

甲壳质

"In the long run," as John Maynard Keynes observed, "we are all dead. " True. But can the (1) run be elongated in a way that makes the long run (2) And if so, how, and at what cost People have dreamt of (3) since time immemorial. They have sought it since the first alchemist put an elixir of (4) on the same shopping list as a way to turn lead into gold. They have (5) about it in fiction, from Rider Haggard’s "She" to Frank Herbert’s "Dune". And now, with the growth of (6) knowledge that has marked the past few decades, a few researchers believe it might be within (7) .

To think about the question, it is important to understand why organisms-people (8) -age in the first place. People are like machines: they (9) That much is obvious. However, a machine can always be (10) A good mechanic with a stock of spare parts can keep it going (11) . Eventually, no part of the (12) may remain, but it still carries on, like Lincoln’s famous axe that had three new handles and two new blade.

The question, of course, is whether the machine is worth (13) . It is here that people and nature (14) . Or, to put it slightly (15) , two bits of nature disagree with each other. From the individual’s point of view, (16) is an imperative. You cannot reproduce unless you are alive. A fear of death is a sensible evolved response and, since (17) is a sure way of dying, it is no surprise that people want to stop it in its tracks. Moreover, even the appearance of ageing can be (18) . It (19) the range of potential sexual partners who find you attractive-since it is a sign that you are not going to be (20) all that long to help bring up baby-and thus, again, curbs your reproduction.

17（）

A.ageing

B.fearing

C.disease

D.disaster

如果胃窦部发现一个溃疡，根据学过的病理知识怎样说明此溃疡是良性溃疡还是恶性溃疡，请列表说明？