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【单选题】
核酸具有紫外吸收特征的原因，是由于嘌呤和嘧啶环中有A.
氮原子
B.
连接了磷酸基团
C.
硫原子
D.
共轭双键
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反馈参考答案：
举一反三
【单选题】Reading:Pulling strings to build pyramids 4. Gharib and Graff tested their theory before applying it.
A.
True
B.
False
C.
Not given
D.
I don't know
【单选题】Reading:Pulling strings to build pyramids 1.It is generally believed that large numbers of people were needed to build the pyramids.
A.
True
B.
False
C.
Not given
D.
I don't know
【单选题】Reading:Pulling strings to build pyramids 5. The success of the actual experiment was due to the high speed of the wind.
A.
True
B.
False
C.
Not given
D.
I don't know
【单选题】Reading:Pulling strings to build pyramids 3. Gharib had previously done experiments on bird flight.
A.
True
B.
False
C.
Not Given
D.
I don't know
【单选题】Reading:Pulling strings to build pyramids 6. They found that, as the kite flew higher, the wind force got stronger.
A.
True
B.
False
C.
Not Given
D.
I don't know
【单选题】听力原文：It was widely believed that he was pulling the strings behind the CEO. What does the speaker mean?
A.
Many people believed that he was giving a lot of support to the CEO.
B.
Many people believed that he was secretly controlling the CEO.
C.
Many people believed that he was secretly doing things against the CEO.
D.
Many people believed that he was secretly offering bribe to the CEO.
【单选题】Reading:Pulling strings to build pyramids 7. The team decided that it was possible to use kites to raise very heavy stones.
A.
True
B.
False
C.
Not given
D.
I don't know
【单选题】Reading:Pulling strings to build pyramids 2. Clemmons found a strange hieroglyph on the wall of an Egyptian monument.
A.
True
B.
False
C.
Not Given
D.
I don't know
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