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【单选题】
下列关于"噬菌体侵染细菌的实验"的叙述,正确的是A.
分别用含有35S和32P的培养基培养噬菌体
B.
分别用35S和32P标记的噬菌体侵染未被标记的大肠杆菌，进行长时间的保温培养
C.
用35S标记噬菌体的侵染实验中，沉淀物存在少量放射性可能是搅拌不充分所致
D.
32P、35S标记的噬菌体侵染实验说明DNA是主要的遗传物质
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【判断题】Although Nathaniel Hawthorne is ambiguous and his tales are often capable of more than one interpretation, he is at his best when writing about evil.
A.
正确
B.
错误
【简答题】请写出下列程序的输出结果。( ) intece Com{ public void speak(); } public class E { public static void main(String args[]) { Com p=new Com() { public void speak() { System.out.println("p是接...
【简答题】请写出下列程序的输出结果：x=-12if x<0: x=-xprint(x)
【简答题】He is always ready to argue things . He doesn't realize that he should think things first. The trouble with him is that his tongue always moves more quickly than his brain.
【单选题】He is taller than his elder brother. [ ]
A.
plenty of
B.
a lot of
C.
a lot
D.
a bit of
【单选题】Although he is more serious _____ his studied than I am , my grades are better than his.
A.
. with
B.
. for
C.
. about
D.
. at
【单选题】_____ he is only 8 years old, he knows more than science than his father. [ ]
A.
But
B.
Though
C.
So
D.
Because
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