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【单选题】
下列有关玉米种子的叙述，正确的是 （ ） （1）玉米种子的胚由胚芽、胚轴、胚根、子叶四个部分组成。 （2）玉米种子的胚是主要部分，是新植物体的幼体。 （3）将一粒玉米种子纵切后，在切面滴碘液，整个切面都变得一样蓝。 （4）种子中的子叶发育为叶，胚芽发育为芽，胚轴发育为茎，胚根发育为根。A.
（1）（2）
B.
(2)(3)
C.
(3)(4)
D.
(2)(4)
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【单选题】How often does the group rehearse?
A.
Once a week.
B.
Twice a week.
C.
Three times a week.
D.
Three times a month.
【单选题】—How often does the boy go to see his granny? —_______. [ ]
A.
Twice a month
B.
Two times a month
C.
Three time a month
D.
One time a week
【单选题】According to the author, what Franck Ketchouang wrote was______.
A.
silly
B.
simple
C.
remarkable
D.
disputable
【单选题】As mainstream chip production technology shifts from one generation to the next every three to five years, plants with new technology can make more powerful chips at lower costs,______plants with outd...
A.
because
B.
even though
C.
while
D.
since
【单选题】The tragedy of five construction workers is cited to prove that
A.
the bridge is a remarkable feat in itself.
B.
the bridge has seen many tragedies.
C.
challenges to build the bridge were tremendous.
D.
the authority employed unqualified workers.
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