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【多选题】
城市生态系统的脆弱性表现在______。A.
不是一个“自给自足”的系统，需靠外力才能维持
B.
在一定程度上破坏了自然的调节机能
C.
食物链简化。系统自我调节能力小
D.
其营养关系出现倒置
E.
缺乏分解者，生产者数量少
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举一反三
【单选题】女性，45岁，胆囊结石5年，曾胆绞痛发作3次，8超示胆囊结石5枚，直径l～2cm。首选的治疗方法是
A.
胆囊切除
B.
溶石治疗
C.
体外震波碎石治疗
D.
抗感染治疗
E.
排石治疗
【单选题】Twain was a man who became obsessed with the frailties of the human race, who saw clearly ahead a black wall of night.
A.
processed
B.
observed
C.
occupied
D.
absorbed
【单选题】Considering the foggy weather, we can’t _____the possibility of the train coming late again. [ ]
A.
predict
B.
discount
C.
decline
D.
reserve
【单选题】What can we infer from the conversation?
A.
Mr. Johnson is an experienced applicant for a professional job.
B.
Mr. Johnson is an experienced applicant for a manual job.
C.
Mr. Johnson doesn't like the cold weather in California.
D.
Mr. Johnson studies engineering.
【简答题】已知列表lst=[1,2,[3,4,5],[6,7,8,9]]，则表达式lst[3][2]的值为：
【单选题】... a man who became obsessed with the frailties of the human race, who saw clearly ahead a black wall of night.
A.
processed
B.
observed
C.
occupied
D.
absorbed
【单选题】Which of the following statements can we know from the fourth paragraph?
A.
Distinguished professors at research universities should focus on research only.
B.
The separation of teaching from research may affect the quality of future scientists.
C.
It is vitally important to improve teaching in elementary schools in order to train new scientists.
D.
It is impossible to combine research with teaching due to the rapid development of modern science.
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