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【单选题】
花药培养选择什么发育时期的花药（）。A.
四分体期
B.
C.
二核期
D.
三核期
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【简答题】评析《天朝田亩制度》
【单选题】听力原文：W: How can I go to the Summer Palace? M: Go straight ahead．and you'll see a bus stop there. Q: How does the woman go to the Summer Palace? (17)
A.
By car.
B.
By bus.
C.
By bike.
【简答题】图1所示基本共射放大电路中，已知 Ucc=12V, UBE= O. 7V, Rc = 3kΩ，β=50,rbb' =300Ω, C1和C2足够大。试求: (1)若静态时Uceq=6V ,Rb =? (2)不接负载时Au=? (3)若Rl=3kΩ，Au=?
【简答题】三极管接成图2-5所示电路，已知在图2-5(a)中，β=50，R b =475kΩ，R c =3kΩ，U CC =+15V。在图2-5(b)中，β=100，R b =260kΩ，R c =2kΩ，R e =500Ω，U CC =+10V。设三极管的U BE =0.7V，求电路的静态工作点。
【简答题】如何评价《天朝田亩制度》？
【单选题】According to the interviewee, how do bacteria develop resistance?
A.
Some bacteria are so strong that drugs can't get into the cells.
B.
Some bacteria are able to drive the drugs out of their cells.
C.
Some bacteria are able to hide behind other ones.
D.
Some bacteria can reproduce before they are killed by drugs.
【简答题】How do straight-A students schedule their time ?
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