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【单选题】
有关肺气肿的发生原因中，哪项是错误的：A.
α1-抗胰蛋白酶缺乏
B.
弹性蛋白酶活性受抑制
C.
小气道的狭窄、阻塞
D.
中性粒细胞和单核细胞分泌的蛋白水解酶数量增多、活性增强
E.
细支气管和肺腺泡的慢性炎
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举一反三
【简答题】如图所示，请根据图中的物理现象分析回答下列问题： （1）图a说明被跳水运动员压弯了的跳板具有_______________________； （2）图b中所示的情景中你的认识是_______________________________________； （3）图c中，上瓶内装有空气，下瓶内装有红棕色的二氧化氮气体，将上下两瓶间的玻璃板抽掉，过一段时间后，两瓶气体混合在一起，颜色变均匀。这个现象...
【单选题】Task 2 Paul is talking with Linda about her start-up on phone. Listen to the conversation and choose the best answer to each question you hear. 2.
A.
Because he is unable to speak.
B.
Because he is retired.
C.
Because he is not involved in the company’s daily operations.
D.
Because he is cautious in giving advice on the company’s daily operations.
【单选题】Why does Gupta have the chance to work with Nathaniel Anthony Ayers? a. Because they both work in Juilliard School. b. Because Gupta and Ayers live in the same community c. Because Gupta is enthusiast...
A.
Because they both work in Juilliard School.
B.
Because Gupta and Ayers live in the same community
C.
Because Gupta is enthusiastic about music and neurobiology
D.
Because they belong to the same organization
【简答题】Listen to the conversations and write down the reasons why an apology is made in each case. 1. Because he . 2. Because she was late for work. . 3. Because he about quitting. 4. Because he .
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