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【单选题】
下面是对四个实验绘制的图形，其中实验结果与图形对应准确的是A.
图①是pH=13的NaOH溶液中加水稀释
B.
图②是用适量的KClO 3 和MnO 2 混合物加热制O 2
C.
图③是向一定量的稀盐酸和氯化钙的混合溶液中不断滴入碳酸钠溶液至过量
D.
图④向一定质量的稀盐酸中加入铁粉至过量
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【单选题】According to the passage, what might be a barrier to marriage in 2050 ?
A.
Age and education.
B.
Influence from the outside world.
C.
Practice of non-marriage.
D.
Financial independence.
【单选题】According to paragraph 1, all the following are generally assumed to be true EXCEPT:
A.
It is important for animals' daily activities to be coordinated with recurring events in their environment.
B.
Eukaryotes have internal clocks.
C.
The relationship between biological function and environmental cycles is a topic of intense research.
D.
Animals' daily rhythms are more dependent on external cues than on internal clocks.
【单选题】According to the speaker, why are the humanities important?
A.
They provide us with facts, truth and objectivity.
B.
They provide us with social workers, teachers and artists.
C.
They provide us with many things that we never thought of before.
D.
They provide us with the ability to help others in our local community.
【单选题】According to family members, Boeing is mainly concerned with:
A.
Profits
B.
Safty
C.
Lawsuits
D.
Compensation
【单选题】According to the conversation, which statement is true?
A.
The number of city dwellers(城市居民） should be controlled.
B.
City dwellers should be aware of the problem.
C.
The government should limit the number of vehicles in a city.
D.
The Government should be aware of the problem.
【多选题】关于双抗体夹心法 ELISA,正确的表述是
A.
使用分别针对抗原不同决定基的两种单克隆抗体作酶标记
B.
一种单克隆抗体作为固相抗体,另一种作为酶标抗体
C.
可使标本和酶标抗体同时加入
D.
采用高亲和力的单克隆抗体可提高测定的敏感性和特异性
E.
用于检测二价或二价以上的抗原
【单选题】According to the writer, when one door closes, _____________________.
A.
another door certainly opens
B.
other opportunities will come to you
C.
another door will not necessarily open
D.
things will change from bad to good
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