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若细胞的 yw = ys ，将其放入纯水中时，体积不变。
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有一充分饱和的细胞，将其放入比液泡液浓度低10倍的溶液中，体积不变。
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2019年12月B级考试全真试题Part I Listening Comprehension [25 minutes]Directions: This part is 10 test your listening ability. It consists of 4 sections.Section A[音频]Directions: This section is to test your ability to give proper responses There are 7 recorded questions in it. After each question, there is a pause. The questions will be spoken two times. When you hear a question, you should decide on the correct answer from the 4 choices marked A)，B), C) and D) given in your test paper. Then you should mark the corresponding letter on the Answer Sheet with a single line through the center.Example: You will hear:You will read:A) I'm not sure.C) Yes, certainly.B) You're right.D) That's interesting.From the question we learn that the speaker is asking the listener to leave a message. Therefore, C) Yes, certainly is the correct answer: You should mark C) on the Answer Sheet with a single line through the center. Now the test will begin.1.A) It's kind of you.B) Take care.C) Mind your step.D) Sure.2. A)Never mind.B) OK.C)You’re welcome.D) Don't mention it.3.A) None of your business.B) I'm fine.C) Here you are.D) It doesn't matter.4. A) No problem.B) It's over there.C) This way, please.D) Not at all.5.A) All right.B) Glad to see you.C) Take it easy.D) Go along the street.6.A) Yes, I can.B) No idea.C) Yes, please.D) Good luck.7.A) On foot.B) In cash.C) By bus.D) On Sunday.Section BDirections: This section is to test your ability to understand short dialogues. There are 7 recorded dialogues in it. After each dialogue, there is a recorded question. Both the dialogues and questions will be spoken two times. When you hear a question, you should decide on the correct answer from the 4 choices marked A), B), C) and D) given in your test paper. Then you should mark the corresponding letter on the Answer Sheet with a single line through the center. Now listen to the dialogues.8.A) A movie ticket.B) A meeting room.C) A fight.D) A table.9.A) He has been promoted.B) He has passed the road test.C) He has got a job offer.D) He has bought a new car.10.A) To see off a customer.B) To visit his friend.C) To meet his parents.D) To pick up his luggage.11.A) It was too noisy.B) It was too far away.C) It was too large.D) It was too crowded.12.A) Friendly.B) Serious.C) Hard-working.D) Open-minded.13.A) Make a complaint.B) Apply for a job.C) See a doctor.D) Place an order.14.A) Sign a contract.B) Meet new clients.C) Tour the city.D) See his friends.Section CDirections: In this section, there are 2 recorded conversations. After each conversation, there are some recorded questions. Both the conversations and questions will be spoken two times. When you hear a question, you should decide on the correct answer from the 4 choices marked A), B)，C) and D) given in your test paper:. Then you should mark the corresponding letter on the Answer Sheet with a single line through the center. Now listen to the conversations.Conversation 115. A) Computer science.B) The latest software.C) Big Data in marketing.D) The importance of education.16. A) He will meet his lawyer.B) He will be away on business.C) He has been busy with his paper.D) He will pay a visit to his parents.Conversation 217. A) It can't start.B) Its keyboard doesn't work.C) It gives no sound.D) Its screen is broken.18. A) Three days ago.B) Six days ago.C) A month ago.D) Three months ago.19. A) His ID card.B) His business card.C) His address.D) His receipt.Section DDirections: In this section you will hear a recorded short passage. The passage is printed in the test paper, but with some words or phrases missing. The passage will be read three times. During the second reading, you are required to put the missing words or phrases on the Answer Sheet in order of the numbered blanks according to what you hear. The third reading is for you to check your writing. Now the passage will begin.I should say that teaching English in China is a real job, and the schools 20you to be professional and you have to21.If you don't meet their requirements, it is easy to get fired. But with22and the right attitude, it will be a very good experience where you will23about China and yourself! I am so happy that I took this24when I had it, and the memories will be with me for the rest of my life.
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