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【单选题】
It is these poisonous products _____ can cause the symptoms of the flu, such as headaches and aching muscles.
A.
who
B.
that
C.
how
D.
what
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【判断题】大肠杆菌色氨酸操纵子转录是通过操纵区和阻遏蛋白控制的。当色氨酸供应不足时，阻遏物失去了所结合的色氨酸，从操纵区上解离下来，trp操纵子的转录就此开始。这个系统是典型的负控诱导系统。
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【单选题】Section A Directions: In this section, there are 10 incomplete sentences. You are required to complete each one by deciding on the most appropriate word or words from the 4 choices marked A , B, C, an...
A.
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【单选题】Section A Directions: In this section, there are 10 incomplete sentences. You are required to complete each one by deciding on the most appropriate word or words from the 4 choices marked A , B, C, an...
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【单选题】Section A Directions: In this section, there are 10 incomplete sentences. You are required to complete each one by deciding on the most appropriate word or words from the 4 choices marked A , B, C, an...
A.
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B.
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C.
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A.
to
B.
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A.
hears
B.
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