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【单选题】
Some students often listen to music __________ classes to refresh themselves.A.
between
B.
among
C.
over
D.
during
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举一反三
【单选题】He took the blind girl ’ s arm and her through the doorway.
A.
sent
B.
guided
C.
had
D.
attend
【单选题】How did Braille become blind?
A.
He was born blind.
B.
He became blind as a result of an accident.
C.
After taking some medicine, he became blind.
【简答题】某烃A(C 4 H 8 )，在较低温度下与氯气作用生成B(C 4 H 8 Cl 2 )；在较高温度下作用则生成C(C 4 H 7 Cl)。C与NaOH水溶液作用生成D(C 4 H 7 OH)，但与NaOH醇溶液作用却生成E(C 4 H 6 )。E与顺丁烯二酸酐反应生成F(C 8 H 8 O 3 )。试推断A～F的构造。
【单选题】关于髓袢说法错误的是（）
A.
髓袢升支粗段是NaCl重吸收的主要部位
B.
髓袢升支细段对水不通透，而对Na + 和Cl - 却易通透
C.
髓袢是肾小管其中的一段
D.
呋塞米通过抑制髓袢升支粗段达到利尿作用
E.
髓袢降支细段的钠泵活性很高，对Na+通透性较高，对水不易通透
【简答题】He took the blind girl’s arm and _____her through the doorway.
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