【简答题】组成蛋白质的氨基酸中,酸性氨基酸有 和 ,碱性氨基酸有 、 和 。
【单选题】My cousin is a __________. She teaches music in my school. [ ]
【单选题】My cousin is a secretary. She ______in that company for over six years.
【单选题】当运动神经末梢不再有动作电位传来时,肌细胞兴奋时释放到肌浆中Ca2+通过什么机制回收缩到肌质网?
【单选题】The text is divided into 3 parts. Part II is para3-6. What's the main idea of this part?
A.
The author raises the question and gives the answer.(Confidence is the key to success.)
B.
The author supports the main idea by giving examples.
C.
The author repeats and strengthens the main idea. (Conceit encourages a doctor in trying moments.)
【单选题】My cousin is a ______. He works in a restaurant. [ ]
【简答题】Answer the following questions. 1. What's the full name of the sickness? 2. Where did the contagion break out? 3. What animal is the host of the sickness? 4. What are the symptoms of the disease? 5. W...