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【多选题】
近亲繁殖的遗传效应有()。A.
杂合体通过自交可以导致后代基因的分离，将使后代群体中遗传组成迅速趋于纯合化。
B.
杂合体通过自交能够导致等位基因纯合，使隐性性状得以表现出来，从而可以淘汰有害的隐性个体，改良群体的遗传组成。
C.
杂合体通过自交，能够导致遗传性状的稳定，自交或近亲繁殖对于品种和物种的相对稳定性具有重要意义。
D.
多代近亲繁殖可获得在大部分基因位点达到纯合状态的纯系，将纯系间杂交可以产生强杂种优势。
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【单选题】It was not until she married him ________ she had made a terrible mistake.
A.
did she realize
B.
she realized
C.
that she realized
D.
realized she
【单选题】下面关于林业“五大转变”错误的是( )。
A.
由以木材生产为主向以生态建设为主转变。
B.
由以采伐人工林为主向采伐天然林为主转变。
C.
由毁林开荒向退耕还林转变。
D.
由无偿使用森林生态效益向有偿使用森林生态效益转变
【单选题】The old woman could not _____ the terrible noise, and she had to close the door and windows.A．be
A.
26. The old woman could not _____ the terrible noise, and she had to close the door and windows. A．bear
B.
accept
C.
receive
D.
Hold
【简答题】You should spend about 20 minutes on this task. The bar chart below shows the percentage of students who passed their high school competency exams, by subject and gender, during the period 2010-2011. ...
【单选题】“Wendy has a terrible cold． “How long__________ it?” A.has she hadB.she has had##
A.
“Wendy has a terrible cold． “How long__________ it?” A.has she had
B.
she has had
C.
had she
D.
she has
【单选题】Why did Rosy have a terrible dream?
A.
She had worked hard.
B.
She had taken a pill.
C.
Her body shook.
D.
She had thought too much of her exams.
【简答题】Over the years she had tried her best to ______ the terrible memory, but it was not an easy task. A．live on B．block out C．bring back D．call up
【单选题】在住院处办理完入院手续后,可免去沐浴的患者是
A.
左心衰竭的患者
B.
风湿性关节炎的患者
C.
高血压 I级的患者
D.
慢性支气管炎的患者
E.
胆结石待手术的患者
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