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【单选题】
HIV通过下列哪个成分与T淋巴细胞膜上CD4分子结合而进入靶细胞?A.
RNA
B.
P24
C.
gp120
D.
gp41
E.
RNA逆转录酶
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举一反三
【单选题】--- What do you think of your winning the game? --- On the one hand, I am proud of it; but on the other hand, I feel I it better.
A.
could do
B.
would do
C.
could have done
D.
must have done
【单选题】One thing AT doesn't do is to______．
A.
use the need of people to share
B.
show people they have the right to be themselves
C.
help people to be aggressive at anytime even when others suffer
D.
help people overcome fear
【单选题】—_______ I use your ruler, Millie? —Sorry, I don't have one. [ ]
A.
Do
B.
Can
C.
Am
D.
Should
【单选题】According to the text, one unforeseen consequence of hand free use has been______.
A.
an increased incident of unusual behavior
B.
an increase in cell phone costs
C.
an increase in traffic accidents
D.
a decrease in brain cancer from cell phone use
【单选题】叶绿体是植物进行光合作用的场所，下列关于叶绿体结构与功能的叙述，正确的是： [ ]
A.
光合作用中O 2 的生成过程发生在叶绿体基质中
B.
叶绿体中的色素主要分布在类囊体腔内
C.
CO 2 的固定过程发生在类囊体薄膜上
D.
光合作用的产物——淀粉是在基质中合成的
【单选题】How should you signal the crane operator to move slowly ________．
A.
Use one hand to give any motion signal，and place the other hand motionless in front of the hand giving the motion signa
B.
Extend arm with the thumb pointing up，and flex the fingers in and out for as long as the load movement is desired
C.
First tap your elbow with one hand and then proceed to use regular signals
D.
First tap the top of your head with your fist and then proceed to use regular signals
【简答题】光合作用和呼吸作用的实质不同，但二者发生的场所是相同的 （ ）
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