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下图为遗传信息的表达示意图。据图回答下列问题：【图片】（1）图中的物质②为____________，它是以图中①的_______（填“a”或“b”）链为模板合成的，该反应所需要的酶是_________________。（2）已知相关密码子所编码的氨基酸分别为CGA（精氨酸）、UCU（丝氨酸）、GCU丙氨酸）、AGA（精氨酸），则图中③、④代表的氨基酸分别为_________、__________。（3）在同种生物的不同体细胞中，该图解所表示的①、②、⑤不同的是_______。（4）生物体编码20种氨基酸的密码子有_______种，密码子第_________个碱基改变对氨基酸的影响较小。
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【简答题】砖按生产工艺可以分为( )
【简答题】"Won't you do any other subject?"—"Well, it is not decided yet . I don't particularly want to do geology. Astronomy would be quite good, if I'm allowed to do it."
【单选题】—What are you going to do next year? —______. [ ]
A.
I was thinking of it
B.
I have decided to be a singer
C.
I studied in Peking University
D.
I'm not sure. Maybe I will study abroad
【单选题】听力原文：I decided not to do the job, knowing it would take me several days to do it all by myself. Why didn't I do the job?
A.
Because it would be too time-consuming.
B.
Because I wanted to do it myself.
C.
Because nobody had done it before.
D.
Because nobody joined me.
【单选题】I'm going for a field trip but I haven't decided_________.
A.
what to do
B.
to do what
C.
where to go
D.
to go where
【单选题】_______that I could use a kite to attract lighting, I decided to do an experiment.
A.
Having realized.
B.
Realize
C.
To realize
D.
Realized.
【单选题】Under no circumstances _____ that I would meet so many problems when I decided to take the job．
A.
do I expected
B.
have I expected
C.
I expected
D.
did I expect
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