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Question 3

A. Because the business began legal action.
Because the business charged them $7,000.
C. Because the couple said the review was true.
D. Because the couple was too sad and unhappy.

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Question 4

A. Free speech is protected in the US.
B. The news media can be very helpful.
C. Online reviews can be very powerful.
D. Online reviews can lead to legal action.

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以下哪个不属于DNA是遗传物质的经典探究实验

A. 格里菲斯肺炎双球菌体内转化实验
B. 艾弗里转化因子实验
C. T2噬菌体侵染实验
DNA的X射线衍射图谱实验

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关于DNA的说法中，哪项是错误的

A. 其基本组成单位是脱氧核糖核苷酸
B. 四种碱基分别为A T C G
C. 空间结构为双螺旋
D. 碱基对排列在内侧构成其基本骨架

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DNA的X射线衍射图谱是DNA是双螺旋结构的决定性实验证据。

A. 对
B. 错

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Question 3

A. Because the business began legal action. Because the business charged them $7,000. C. Because the couple said the review was true. D. Because the couple was too sad and unhappy.

Question 4

以下哪个不属于DNA是遗传物质的经典探究实验

关于DNA的说法中，哪项是错误的

DNA的X射线衍射图谱是DNA是双螺旋结构的决定性实验证据。

A. Because the business began legal action.
Because the business charged them $7,000.
C. Because the couple said the review was true.
D. Because the couple was too sad and unhappy.