大家在備考英語(yǔ)四六級(jí)考試時(shí)一定要多做真題，這樣才能更好地把握題目難度和重點(diǎn)詞匯等等。今天小編為大家?guī)?lái)2019年12月英語(yǔ)四級(jí)聽(tīng)力真題試卷一：聽(tīng)力篇章2（滬江網(wǎng)校），希望對(duì)你有所幫助~

Questions 19 to 21 are based on the passage you have just heard.
19. A) The function of the human immune system.
B) The cause of various auto-immune diseases.
C) The viruses that may infect the human immune system.
D) The change in people's immune system as they get older.

20. A) Report their illnesses.
B) Offer blood samples.
C) Act as research assistants.
D) Help to interview patients.

21. A) Strengthening people's immunity to infection.
B) Better understanding patients' immune system.
C) Helping improve old people's health conditions.
D) Further reducing old patients' medical expenses.

參考答案：19. D 20. B 21. C?

以上就是今天為大家分享的內(nèi)容啦，各位小伙伴利用好最后的時(shí)間認(rèn)真?zhèn)淇肌Ｐ【幾４蠹移扉_(kāi)得勝！