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【简答题】
两块同样长的花布，第一块用去31米，第二块用去19，第二块剩下的长度是第一块剩下的长度的4倍，求两块花布原来各长多少米？
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皮皮学刷刷变学霸
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A.
G蛋白可与GTP或GDP结合
B.
G蛋白具有GTP酶的活性
C.
G蛋白的三个亚基聚合并与GTP结合的才有活性
D.
G蛋白由3个亚基(α、β、γ)组成
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A.
Writer and reader.
B.
Salesman and customer.
C.
Husband and wife.
D.
Boss and employee.
【单选题】I don't mind ______ criticism but if you are just going to insult me I am not staying.
A.
relative
B.
productive
C.
descriptive
D.
constructive
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【单选题】You can come with me to the museum this afternoon ______ you don't mind walking for half an hour.
A.
unless
B.
so far as
C.
except
D.
if
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