______ much is known about what occurs during sleep, the precise function of sleep and its different stages remains largely in t

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问题 ______ much is known about what occurs during sleep, the precise function of sleep and its different stages remains largely in the realm of assumption.

选项 A、Because
B、For
C、Since
D、While

答案D

解析本题考查连词。分析题干可知，前后两个句子属于转折关系，而非因果关系。A 、B 、C 均表示因果关系，只有D While可以表示转折关系，意为“虽然”，故为答案。

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专业英语四级

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______ much is known about what occurs during sleep, the precise function of sleep and its different stages remains largely in t

专业英语四级

RichpeopleinBritainhavebeenhuntingfoxes

Attentiontodetailsissomethingeveryonecanandshoulddo--especiallyinatightjobmarket.BobCrossIcy,ahuman-resources

Educatortodayaremoreandmoreoften【C1】______tosaythatcomputerliteracyisabsolutelynecessaryforcollegestudents.Ma

Altogetherhowmanypeoplewereinjuredduringtheviolence?

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ImmediatelyaftertheCivilWar,however,thedietbegan【C1】______.Railtransportationincreasedthesupplyand【C2】______the

AnnaDouglaswas72yearsoldwhenshestartedwritinghernewspapercolumn.Shehadbeenthedirectorofaschoolandacampbe

Althoughrecentyearshaveseensubstantialreductionsinnoxiouspollutantsfromindividualmotorvehicles,thenumberofsuch

TheUkrainenationallawmakershavedemanded______.

Thebuses,______werealreadyfull,weresurroundedbyanangrycrowd.

简述单卵孪生和联体双胎的成因。

______提出：“坚持科技兴训，关键是要通过学科技、用科技，不断增大军事训练的科技含量，努力提高军事训练的质量和效益。”()

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在签发支票时，3200．40元的汉字大写金额应写成“叁仟贰佰元肆角”。（ ）

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