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【单选题】
肺炎双球菌有许多类型,其中有荚膜的S型菌有毒性,能引起人患肺炎或使小鼠患败血 症而死亡;无荚膜的R型菌无毒性。下图为研究人员所做的细菌转化实验示意图,下列相 关说法正确的是A.
C组为对照组,实验结果为小鼠死亡
B.
能导致小鼠患败血症死亡的有A、B、D三组
C.
E组实验表明,加入S型菌的蛋白质后试管中长出的还是无毒性的R型菌
D.
D组产生的有毒性的肺炎双球菌不能将有毒性性状遗传给后代
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举一反三
【单选题】Dorothy is a girl who would be sad for a few days even at the death of a tiny ant.
A.
sensuous
B.
sensible
C.
sensitive
D.
sentimental
【单选题】Even a girl, ________ to be her life, and theater audiences were to be her best teachers.
A.
performing by Melissa were
B.
it was known that Melissa's performances were
C.
knowing that Melissa's performances were
D.
Melissa knew that performing was
【判断题】Do the underlined phonemes in the following sentence sound the same ? I ’ll dr i ve f i ve m i les on Fr i day n i ght to see a fl i ght that I l i ke.
A.
正确
B.
错误
【单选题】People say, “Guilin’s scenery is superb in the world.” It was not until I visited the place that I found it really worthy of the _______.
A.
imagination
B.
status
C.
reputation
D.
assessment
【单选题】Dear Students, I am happy that you are now in America. I am happy that you have made new friends from around the world. All of you are growing every day. Like many people, you decided to come to Ameri...
A.
The students have made new friends in America.
B.
The students have made friends with him.
C.
The students have taken his advice.
【单选题】Even as a girl, to be her life, and theater audiences were to be her best teachers.
A.
performing by Melissa were
B.
it was known that Melissa's performance were
C.
knowing that Melissa's performance were
D.
Melissa knew that performing was
【单选题】Even a girl, ____to be her life ,and theater audiences were to be her best teacher.
A.
performing by Melissa were
B.
it was known that Melissa’s performances were
C.
knowing that Melissa’s performances were
D.
Melissa knew that performance was
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