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【单选题】
About Yellow river, which of the followings is correct?A.
The Yellow River is the mother river of the Chinese nation, recording the origin of Chinese civilization.
B.
The middle and lower reaches of the Yellow River are smooth and there are many lakes.
C.
The upper reach of Yellow River passes through the Loess Plateau, where suffers serious water and soil erosions.
D.
It is said that the Yellow Emperor subdued the flooding.
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【简答题】下列各项中，应当征收契税的有（ ）。
【单选题】Today we can either fly to Hainan Island or take a ship___ the sea.
A.
in
B.
across
C.
from in
D.
across from
【简答题】量芯式空气流量传感器主要由#tk#、#tk#、进气温度传感器和线束连接器等组成。
【单选题】某一玉米品系中,没有Ac只有Ds,在玉米的第9号染色体上的基因型是CICCBzbzbz,籽粒糊粉层发育为无色,以下最可能的解释机制是?
A.
Ds不能转座,C I发挥抑制作用。
B.
Ds能转座,染色体断裂并丢失了CI和Bz基因。
C.
Ds能转座,位于Bz内部的Ds从Bz处解离。
D.
Ds不能转座,Bz基因发生突变。