当直流电动机的转速超过（）时,将出现回馈制动

A. 略高一点

B. 相同

C. 略低一点

D. 高很多，出现飞车现象

A．An enzyme-linked receptor is a transmembrane domain receptor, where the binding of an extracellular ligand causes enzymatic activity on the intracellular side

B．A enzyme-linked receptor has an extracellular ligand-binding domain, a transmembrane domain, and an intracellular catalytic domain．

C．The signal transduction pathways of enzyme-linked receptor involve phosphorylation cascades．

D．Enzyme-linked receptor interacts with an intracellular protein called a "G-protein"．

Directions: Choose the appropriate words or expressions in the word bank to complete the passage. Word bank: ins and outs; appreciate; set about; organic; go out; self-sufficient; haul; generate; adjustment; taken for granted; If you want to know all the ________ of living green, then you should visit Backsbottom Farm. It is run by Rod and Jane, who have tried to be as ________ as possible. They use a horse to ________ the logs they cut from their woods. The fields are nourished by ________ waste from the horse and their other animals rather than chemicals. They rely on a windmill to ________ their electricity and when the wind slows down the lights ________ and they have to ________ looking for the candles. Jane, who was brought up in a home where constant electric power was ________, admits it was hard to make the ________ when they first arrived at the farm, but adds that overall they really ________ their new way of life.

阅读短文，判断正（）. I was in town yesterday. I decided to stop at the bank to see Jane. I thought she might have time to go for lunch with me. When I got to the bank, they told me she had just been out. I asked them if she would be back by 10:30 or 11:45, and they told me “Yes”. I had some time, so I decided to wait for her. I walked over to take a seat by the window. I watched everyone coming in. It was 12:30, and I was sure she couldn’t come back until after lunch. I got up, and as I started to walk to the door, someone called my name. I turned around and was surprised to find it was Jane. She said she had not left her office all the morning. 小题1:Yesterday I was in a city. 小题2:I wanted to have lunch with Jane. 小题3:Jane was in her office all the morning. 小题4:I didn’t wait Jane any more. 小题5:In fact, Jane’s workmates made a mistake.