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【單選題】
在用基因工程技術構建抗蟲棉的過程中，下列操作錯誤的是
A.
用同種限制性核酸內(nèi)切酶切割抗蟲基因和運載體
B.
用DNA聚合酶連接經(jīng)切割的抗蟲基因和運載體
C.
將重組DNA分子導入棉花體細胞
D.
基因工程的原理是基因重組
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舉報參考答案：
舉一反三
【單選題】Why won’t Stella go to see the doctor at 3:00 pm? ---- Because she will have to ____.
A.
have a class
B.
attend school
C.
attend a lecture
【單選題】What’s wrong with Stalla Wang ? ------Her ____ had been hurting a lot.
A.
back
B.
hand.
C.
foot
【單選題】Many people attach great importance ____ to university. That is to say many people think it important to go to university.
A.
to going
B.
with go
C.
to go
D.
with going
【單選題】Where is the man going ?
A.
To the next town .
B.
To his hometown .
C.
To a foreign country.
【單選題】What makes the man so tired?
A.
Playing s.
B.
Surfing the Internet.
C.
Searching for interesting people.
相關題目：
【單選題】Why won’t Stella go to see the doctor at 3:00 pm? ---- Because she will have to ____.
A.
have a class
B.
attend school
C.
attend a lecture
【單選題】What’s wrong with Stalla Wang ? ------Her ____ had been hurting a lot.
A.
back
B.
hand.
C.
foot
【單選題】Many people attach great importance ____ to university. That is to say many people think it important to go to university.
A.
to going
B.
with go
C.
to go
D.
with going
【單選題】Where is the man going ?
A.
To the next town .
B.
To his hometown .
C.
To a foreign country.
【單選題】What makes the man so tired?
A.
Playing s.
B.
Surfing the Internet.
C.
Searching for interesting people.
參考解析：
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