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【单选题】
钙含量的测定滴定过程,待测也会经历( )颜色变化。A.
由紫色到红色再到纯蓝色
B.
由无色到红色再到紫红色
C.
由蓝色到红色再带紫红色
D.
由紫红色到紫色再到蓝色
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Mary found that ________ was always the best policy when she got involved in arguments with her husband.
A.
compose
B.
congratulate
C.
compromise
D.
content
【单选题】Mary found it (difficult) to talk (calmly) about (which) she had (experienced) at the station.
A.
difficult
B.
calmly
C.
which
D.
experienced
【单选题】Mary found____extrerhely difficult to pass the examination.
A.
it
B.
this
C.
that
D.
what
【单选题】As a result of their experiments, Dr. Corsi's team found that ______.
A.
dishwashers are very efficient machines.
B.
tap water is as polluted as bottled water.
C.
indoor pollution outdoor pollution.
D.
gas masks are a useful protective device.
【简答题】Mary found it difficult to ________ Jim’s father when he disapproved of their marriage. A) stand for B) stand out C) stand by D) stand up to
【简答题】Mary’s score on the test is the highest in her class; she ________ have studied very hard. A) may B) should C) must D) ought to
【单选题】Mary found ______ extremely difficult to pass the examination.
A.
it
B.
this
C.
that
D.
what
【单选题】Not until the train pulled into the next station _____ her suitcase gone. [ ]
A.
Mary had found
B.
had Mary found
C.
did Mary find
D.
Mary found
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