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【单选题】
以下关于血管紧张素家族的论述中,正确的是A.
血管紧张素Ⅰ生理活性最强
B.
血管紧张素Ⅱ可直接促进全身微动脉收缩
C.
血管紧张素Ⅱ主要激活AT2受体产生作用
D.
血管紧张素Ⅲ刺激醛固酮生成的作用较弱
E.
血管紧张素Ⅳ无生理作用
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反馈参考答案：
举一反三
【单选题】Patrick lives near two gas stations, Exxon and Shell. If Exxon decreases the price of gas, we predict that the quantity of gasoline demanded at Shell will
A.
decrease because Exxon and Shell gas are complements.
B.
decrease because Exxon and Shell gas are substitutes.
C.
increase because Exxon and Shell gas are substitutes.
D.
increase because Exxon and Shell gas are complements.
E.
not change Exxon and Shell are different brands of gasoline.
【简答题】这些问题与Hershey-Chase实验有关：
【单选题】Look ! There are some people _______ a thief. [ ]
A.
chase
B.
to chase
C.
chasing
D.
chased
参考解析：
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