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【单选题】
某小岛上原有果蝇20000只，其中基因型VV、Vv和vv的果蝇分别占15%、55%和30%。若此时从岛外入侵了2000只基因型为VV的果蝇，且所有果蝇均随机交配，则F 1 V的基因频率约是 [ ]A.
43%
B.
48%
C.
52%
D.
57%
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【单选题】he said ,“don’t do that again.”
A.
_____me____that again.
B.
Said to;not to do
C.
Said to;don’t do
D.
Told;don’t do
E.
Told;not to do
【单选题】He said,"Don't do that again. " He ______ me _________ that again.
A.
said to; not to do
B.
said to; don't do
C.
told; don't do
D.
told; not to do
【单选题】用以下几类土作填筑材料时,基本工程性质由好到差的正确排 列是:
A.
砂性土——粉性土——黏性土
B.
砂性土——黏性土——粉性土
C.
粉性土——黏性土——砂性土
D.
黏性土——砂性土——粉性土
【单选题】(Topic sentence missing) Eric exercised each day for eight years to strengthen his muscles. S ometimes he rode his bicycle 100 miles a day! I n addition, he lifted weights, roller-skated (滑冰) , and “ ...
A.
The 1980 Winter Olympics was a spectacular event.
B.
Eric Heiden won five gold medals at 1980 Winter Olympics.
C.
Eric Heiden worked hard to get in shape for the 1980 Winter.
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