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He said there were a few points in the essay ______ (他发现难以理解).

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______ (到了有关当局采取措施的时候) solve traffic problems.

Passage Three Questions 33 to 35 are based on the passage you have just heard.

A. They lose water constantly.
B. They contain a relatively lower concentration of salt.
C. They neither lose nor absorb water.
D. They possess a relatively higher concentration of salt.

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Questions 23 to 28 are based on the conversation you have just heard.

A. Flies need less sleep than humans.
B. Humans need a similar amount of sleep with flies.
C. The amount of human sleep is determined by certain gene.
D. Flies can determine how much sleep they nee

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女性，14岁，左股骨下端肿胀、疼痛4个月；近1个月来肿胀增长快，夜间疼痛明显。检查：左胫骨上端肿胀严重，皮温增高，浅静脉怒张，可扪及一个6cm×8cm大小肿块，固定，边界不清。X线片示左胫骨上端成虫蚀状溶骨性破坏，骨膜反应明显，可见Codman三角。住院后拟行手术治疗，下列哪项检查必不可少（）

A. 淋巴结活检
B. 骨髓穿刺
C. 胃肠道钡餐检查
D. 胸部X线片
E. 下肢血管造影

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