Which statement about allosteric control of enzymatic activity is FALSE（）
Allosteric effectors give rise to sigmoidal V versus [S] kinetic plots
B. An effector may either inhibit or activate an enzyme
C. Binding of the effector changes the conformation of the enzyme molecule
D. Heterotropic allosteric effectors compete with substrate for binding sites
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前照灯检验仪，通过采用能把吸收的光能变成电流的光电池作为传感器，按照前照灯光轴照射时光电池产生的电流来测量发光强度和光轴偏斜量。（）
A. 错误
B. 正确
前照灯检验不合格有两种情况：一是前照灯发光强度偏低；二是前照灯照射位置偏斜。（）
A. 错误
B. 正确
According to the passage, when is the baseball season in the year（）
A. From March to April
B. From March to October
C. From mid-October to March
D. From April to mid-October
Qustions 1-5 are based on Text B, please choose the best answer to each of the following questions:Why did Jonda fail to save the teenager many years ago（）
A. Because she was too terrified to take any action
Because she was pulled back by some other people
C. Because the road was too slippery to move forward
D. Because the car was on fire and she could not get near it
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