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单项选择题

用于鉴别有机物的化学反应应该具有颜色变化、沉淀产生、气体生成或浑浊出现等易于观察的明显现象。（ ）

A．对
B．错
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相关考题

单项选择题
选择重音位置正确的单词(      )
A、(com)poser
B、com(po)ser
C、compo(ser)
单项选择题
设计一个好的哈希函数，其函数值应该以()取其值域的每个值。
A、同等概率
B、随机概率
C、最大概率
D、最小概率
问答题
Unit 4 Test Writing 
Directions: Read the following paragraph, and analyze the question-example-conclusion pattern. Find the question, example and the concluding sentence.
 
[1] Some first responders do not succeed in helping others and they get injured or die in their efforts. [2] Do these people become heroes because of what happens to them as they try to help others –  instead of what they actually make happen? [3] Eleanor McMahon was sure that Sgt. Russell was indeed a hero because he showed distinct courage when trying hard to stop the snowplow before it hurts others. [4] She strongly argued: it’s natural for people to rush toward safety and away from danger. [5] But heroes rush toward danger to help those in need. [6] We expect first responders to rush forward, especially when we or our loved ones are in danger. [7] So when they die doing that, we should recognize their heroic efforts.
 
(1)1. Which sentence is the “Question” ?
A. Sentence 1
B. Sentence 2
C. Sentence 4
D. Sentence 7
 
(2)2. Which sentences are “Examples”?
A. Sentence 2-3
B. Sentence 3-5
C. Sentence 4-6
D. Sentence 4-7
 
(3)3. Which sentences are “Concluding sentences”?
A. Sentence 1-3
B. Sentence 2-5
C. Sentence 6-7
D. Sentence 4-7
 
 
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