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【单选题】
外胚乳的细胞内染色体数目为( )。A.
3N
B.
2N
C.
N
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反馈参考答案：
举一反三
【简答题】ISO在制定OSI参考模型进行层次划分的原则有哪些?
【单选题】The noise outside was () .
A.
too irritating that
B.
so irritating so his speech was hardly audible
C.
so irritating that his speech was hardly audible
D.
so irritating enough that his speech was hardly audible
【单选题】—What’s the noise outside? —The kids ______ in the garden.
A.
have played s
B.
play s
C.
are playing s
D.
are played s
【单选题】The noise outside the classroom ______ me from listening attentively to the teacher.
A.
contracted
B.
distracted
C.
subtracted
D.
abstracted
【单选题】Could you please shut the door; the noise outside ______ the speaker’s voice.
A.
drowns
B.
chokes
C.
buries
D.
fills
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