【正文】 e floor, brought abstract expressionism before a hostile public. Willem de Kooning39。 開放英語（ 2）期末自測參考答案 一部分： 1C 2C 3C 4A 5A 二部分： 6A 7C 8C 9B 10B 11C 12C 13A 14A 15C 16A 17B 18A 19C 20C 21A 22A 23C 24A 25A 三部分： 26A 27B 28C 29C 30A 31A 32B 33A 34B 35C 四部分： is a very interesting film best football team ’m afraid would rather ，她將會買一間大房子 請您刪除一下內(nèi)容， O(∩ _∩ )O謝謝?。?！ 2021年中央電大期末復(fù)習(xí)考試小抄大全，電大期末考試必備小抄，電大考試必過小抄Acetylcholine is a neurotransmitter released from nerve endings (terminals) in both the peripheral and the central nervous systems. It is synthesized within the nerve terminal from choline, taken up from the tissue fluid into the nerve ending by a specialized transport mechanism. The enzyme necessary for this synthesis is formed in the nerve cell body and passes down the axon to its end, carried in the axoplasmic flow, the slow movement of intracellular substance (cytoplasm). Acetylcholine is stored in the nerve terminal, sequestered in small vesicles awaiting release. When a nerve action potential reaches and invades the nerve terminal, a shower of acetylcholine vesicles is released into the junction (synapse) between the nerve terminal and the ‘effector’ cell which the nerve activates. This may be another nerve cell or a muscle or gland cell. Thus electrical signals are converted to chemical signals, allowing messages to be passed between nerve cells or between nerve cells and nonnerve cells. This process is termed ‘chemical neurotransmission’ and was first demonstrated, for nerves to the heart, by the German pharmacologist Loewi in 1921. Chemical transmission involving acetylcholine is known as ‘cholinergic’. Acetylcholine acts as a transmitter between motor nerves and the fibres of skeletal muscle at all neuromuscular junctions. At this type of synapse, the nerve terminal is closely apposed to the cell membrane of a muscle fibre at the socalled motor end plate. On release, acetylcholine acts almost instantly, to cause a sequence of chemical and physical events (starting with depolarization of the motor endplate) which cause contraction of the muscle fibre. This is exactly what is required for voluntary muscles in which a rapid response to a mand is required. The action of acetylcholine is terminated rapidly, in around 10 milliseconds。 This is the house where she lives. 這就是她住的房子 。 情態(tài)動詞表示推測、惋惜（ Unit 26） * P! l → 哪句語氣最肯定？ He could be at home. He can’t be at home. He must be at home → 下面哪句話表示了 “我本該把包放在家里的 ”這句話的意思： I could have put the bag at home. I should have put the bag at home I must have put the bag at home. 功能句：（編寫一組小對話） 除了前面學(xué)到的用 How about…, Whey don’t…, Shall we …, Let’s… 提出建議，在 Unit29里面，你學(xué)到了用 If I were you, I’d (I would) +動詞原形 這種委婉地提出建議的說法。 I’ll finish my homework by 9 o’clock.. 我會在九點前完成家庭作業(yè) I’m in a meeting until . 我開會開到一點鐘。 both/ both of …/ both…and … 中選詞填空。 43. 我得在六點前到達(dá)機(jī)場。 。 She has lost her wallet. 。 44. 我一定是把相機(jī)丟在那家商店里了。 The new web page can be either blue or red. 新的網(wǎng)頁可以是藍(lán)色的，也可以是紅色的。 。你能用這個句型造一個句子嗎？ If I were you, I’d call her 你對面授課的建議是 :希望老師能介紹記憶單詞和詞組的速記方法 一部分： 1B 2A 3C 4C 5B 二部分： 6C 7C 8A 9B 10A 11B 12B 13C 14A 15B 16C 17B 18A 19A 20B 21B 22A 23B 24C 25C 三部分： 26B 27C 28B 29B 30C 31C 32B 33B 34B 35A 四部分： 36. I’d like a salad, please 37. He is wearing a red Tshirt 38. Shall we have something to eat 39. must have put it 40. either by bus or by subway 41. 我們有足夠的錢改進(jìn)網(wǎng)站。 Our designer, who joined us last year, works very hard. 我們的設(shè)計師工作很努力，他是去年加入我們一起的。 an enzyme (cholinesterase) breaks the transmitter down into choline and an acetate ion. The choline is then available for reuptake into the nerve terminal. These same principles apply to cholinergic transmission at sites other than neuromuscular junctions, although the structure of the synapses differs. In the autonomic nervous system these include nervetonerve synapses at the relay stations (ganglia) in both the sympathetic and the parasympathetic divisions, and the endings of parasympathetic nerve fibres on nonvoluntary (smooth) muscle, the heart, and glandular cells。s first oneman show in 1948 established him as