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【单选题】
下列说法中，不正确的是A.
Cl - 是氯原子得到1个电子后形成的
B.
“Cu”可以表示铜单质，也可以表示铜元素
C.
碘原子的质子数为53，可推知其核外电子数为53
D.
镁原子的最外层有2个电子，在化学反应中易得到电子
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反馈参考答案：
举一反三
【多选题】How the questions in a questionnaire should be designed?
A.
Ask “closed questions” if you expect unique or elaborated answers.
B.
Ask “open questions” if you expect unique or elaborated answers.
C.
Ask “closed questions” if you want to standardize the answers so that they can be easily calculated or compared.
D.
Ask “open questions” if you want to standardize the answers so that they can be easily calculated or compared.
【单选题】What helps a person to do a particular task better in visual perceptual learning?
A.
Testing．
B.
Encouragement．
C.
Self—assessment．
D.
Repetition．
【单选题】为研究胃溃疡病与饮酒的关系，某大夫调查了100名胃溃疡病人的饮酒史和100名胃炎病人的饮酒史。根据以上资料，该研究的主要缺陷是（）。
A.
样本含量太少
B.
调查方法不明确
C.
饮酒调查误差大
D.
对照不合适
E.
没有随访
【单选题】为研究胃溃疡病与饮酒的关系，某大夫调查了100名胃溃疡病人的饮酒史和100名胃炎病人的饮酒史，这是属于（）。
A.
群组研究
B.
病例对照研究
C.
实验流行病学研究
D.
现况研究
【单选题】According to the article, ______.
A.
Candidates should ask questions at the end of the interview.
B.
Interviews should all last for roughly the same length of time.
C.
Interviewers should ask all the candidates the same question.
【单选题】__________ ，I should ask them some questions．
A.
Should they come to us
B.
If they come to as
C.
Were they come to us
D.
Had they come to us
【单选题】On what day is the Christmas Day?
A.
December 25
B.
December 24
C.
December 26
D.
December 28
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