電大開(kāi)放英語(yǔ)i(2)形考冊(cè)作業(yè)1-4參考答案小抄(自己整理)-wenkub
2023-06-16 19:11:06 本頁(yè)面
【正文】 is a very interesting film best football team ’m afraid would rather ，她將會(huì)買(mǎi)一間大房子 請(qǐng)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(guò)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。 I saw her get on a bus. 動(dòng)詞－ ing 形式和動(dòng)詞不定式 to do（ Unit35） 下面哪句對(duì)，哪句錯(cuò)？ They haven’t got enough time to design the garden. （對(duì)） I asked him giving me the accounts tomorrow. （錯(cuò)） 更正： I asked him to give me the accounts tomorrow. She is not good at to repair the bicycle.(錯(cuò) ) 更正： She is not good at repairing the bicycle. 表示義務(wù)／責(zé)任／不允許／不必的 have to, must 和 be allowed to, don’t have to 的用法（ Unit34） 選詞填空： I must go to bed early tonight. I’m so tired. I have to leave now. My sister is waiting for me. You mustn’t smoke here because they sell petrol.. You don’t have to pay for that. It’s free. 介詞詞組 in spite of , apart from 和 except for（ Unit 33） 選詞填空： In spite of the rain and the wind, he came on time. A part from Polly, they all frank red wine. 對(duì)對(duì)方的說(shuō)法表示同感 neither, nor, not… either, so （ Unit 35） 把下面的句子翻譯成英語(yǔ)： I don’t smoke, neither does he. Tim丟了相機(jī)， Marry也丟了相機(jī)。 This is the house where she lives. 這就是她住的房子 。 45. 到時(shí)見(jiàn)了面咱們把這些日子發(fā)生的事聊一聊，會(huì)多開(kāi)心啊。 情態(tài)動(dòng)詞表示推測(cè)、惋惜（ Unit 26） * P! l → 哪句語(yǔ)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(huà)表示了 “我本該把包放在家里的 ”這句話(huà)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(xiě)一組小對(duì)話(huà)） 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(dòng)詞原形 這種委婉地提出建議的說(shuō)法。 We’ve bee good friends since last summer. 從去年夏天起我們就成了好朋友了。 I’ll finish my homework by 9 o’clock.. 我會(huì)在九點(diǎn)前完成家庭作業(yè) I’m in a meeting until . 我開(kāi)會(huì)開(kāi)到一點(diǎn)鐘。 My home is far from the city centre. 我家遠(yuǎn)離市中心。 both/ both of …/ both…and … 中選詞填空。 時(shí)態(tài)連用：過(guò)去進(jìn)行時(shí)＋一般過(guò)去時(shí)（ Unit 29） 翻譯下面兩句話(huà)： I was driving along the motorway when my car broke down. 我正在高速路上行駛著，突然車(chē)壞了。 43. 我得在六點(diǎn)前到達(dá)機(jī)場(chǎng)。 This shirt is too small. B： 不，我覺(jué)得夠大了。 。電大 學(xué)前 準(zhǔn)備參考答案 1． B 2. B 3. C 4. C 5. C 6. C 7. C 8. A 9. C 10. C 學(xué)習(xí)記錄卡 1 ： talk talked work worked 不規(guī)則動(dòng)詞： do did Buy bought Tom went to see his parents in the country. 否定句： Tom did’t go to see his parents in the country. 疑問(wèn)句： Did Tom go to see his parents in the country. Dave’s picking up the van tomorrow. 戴夫明天去取車(chē) 。 She has lost her wallet. 。 No, I think it is big enough. 如何點(diǎn)餐： Can I help you, sir? B: Could we have cheese an
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