According to the passage，what is“migration”？
A. Moving from one place to another with the season．
B. Living in burrows in winter．
C. Travelling in the winter months．
D. Leaving one’S own country for another．
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先将企业中岗位价值最高与最低的岗位选择出来，作为高低界限的标准，然后在此限度内，将所有岗位按其价值进行逐一排序。这种岗位评价方法是（）。
A. 岗位分类法
B. 成对排列法
C. 选择排列法
D. 岗位比较法
It can be inferred from the passage that if a woman went out to work before 1 800，she
A. would be looked down upon
B. would be respected
C. had to disguise herself as a man
D. had to be rich and educated
植物体内某些成熟细胞，在一定条件下，会失去成熟细胞的特性而恢复到具有分裂能力的细胞状态，这种现象称为脱
Few airlines want to impose a total ban on their passengers using electronic devices because．
A. they don’t believe there is such a danger as radio interference
B. the harmful effect。of electromagnetic interference is not yet to be proved
C. most passengers refuse to take a plane which bans the use of radio and cassette players
D. they have other effective safety measures to fall back on
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