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【单选题】
温度升高时,三极管的电流放大系数β将( )。A.
变小
B.
变大
C.
不变
D.
变为0
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【单选题】In almost all cases the soft parts of fossils are gone for ever but they were fitted around or within the hard parts. Many of them also were attached to the hard parts and usually such attachments are...
A.
can always be accurately identified
B.
have usually left some traces
C.
can usually be reconstructed
D.
have always vanished without any trace
【单选题】I don’t smoke now, but I ____for almost ten years.
A.
ever smoked
B.
have ever smoked
C.
had ever smoked
D.
was ever smoking
【简答题】A． still B． even C． ever D． almost
【单选题】I don’t drink now, but I ________ for almost ten years.
A.
ever drank
B.
was ever drinking
C.
have ever drunk
D.
had ever drunk
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