【单选题】
1. 肾上腺素作用的翻转是指( )
①
给予β受体阻断药后，再使用肾上腺素，出现的升压效应
②
给予α受体阻断药后，再使用肾上腺素，出现的降压效应
③
肾上腺素具有α.β受体激动效应
④
收缩压上升,舒张压不变或下降
⑤
由于升高血压,对脑血管的被动扩张作用
【单选题】
1. Decide which of the following best states the authors purpose of writing?
①
To express his anguish of movig from his old home
②
To describe the laughter and tears of the four generations of his family
③
to explain the real meaning of his grandpas wordsneversay googbye‘
④
To tell the story of his grandpas death
【单选题】
1．关于酶的叙述哪项是正确的？
①
A．所有的酶都含有辅基或辅酶
②
B．只能在体内起催化作用
③
C．大多数酶的化学本质是蛋白质
④
D．能改变化学反应的平衡点加速反应的进行
⑤
E．都具有立体异构专一性（特异性）
【单选题】
As a freshman, we should get to know campus ( ) as soon as possible and make good use of them.
①
Source
②
sources
③
resource
④
resources
【单选题】
Quizzes are part of the lecture program to keep students engaged and keep them _________, for students to be able to check that they understood what was covered.
①
thinking
②
think a lot
③
to think
④
thought