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【单选题】
(2019·全国卷III) 14A.
B.
C.
D.
D
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【单选题】In order to continue the marriages of the shift workers
A.
wives must learn to care for the children when their husbands are absent
B.
shift work couples must administer their time and activities
C.
wives mustn' t adapt their own feelings of boredom to their husbands' work
D.
all of these
【单选题】Which of the following statements about the R and T state of hemoglobin is wrong?
A.
Although oxygen binds to hemoglobin in either state, it has a significantly higher affinity for hemoglobin in the R state. Oxygen binding stabilizes the R state. When oxygen is absent experimentally, the T state is more stable and is thus the predominant conformation of deoxyhemoglobin.
B.
T and R originally denoted “tense” and “relaxed”, respectively, because the T state is stabilized by a lesser number of ion pairs, many of which lie at the α1β2 (and α2β1) interface.
C.
The binding of oxygen to a hemoglobin subunit in the T state triggers a change in conformation to the R state.
D.
When the entire protein undergoes this transition, the structures of the individual subunits change little, but the αβ subunit pairs slide past each other and rotate, narrowing the pocket between the β subunits. In this process, some of the ion pairs that stabilize the T state are broken and some new ones are formed.
【单选题】听力原文： In some large American city schools, as many as 20-40% of the students are absent each day. There are two major reasons for such absences: one is sickness, and the other is truancy. That is stay...
A.
12-14%
B.
12-40%
C.
20-40%
D.
20-50%
【简答题】Jane was not a good student. Her head was in the clouds(处于幻想之中) most of the time. She wanted to listen in class, but other things seemed more important: her clothes, her hairstyle, films and televisio...
【简答题】单词拼写。 1. His illness a_________ for his being absent from work. 2. I climbed into bed and p____ the blanket over my head. 3. Darwin's t_____ of evolution(进化)is based on the survival of the fittest. 4....
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