When and where to build the new factory _____ yet.
A. is not decided B. are not decided C. has not decided D. have not decided
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科目:高中生物 來(lái)源:2010年安徽省生生物學(xué)聯(lián)賽試卷 題型:選擇題
下列關(guān)于Watson and Crick的DNA雙螺旋模型的說(shuō)法,正確的是( )。
A.組成雙螺旋的兩條DNA鏈反向平行 |
B.堿基對(duì)位于雙螺旋的內(nèi)側(cè) |
C.維系雙螺旋結(jié)構(gòu)的作用力主要是堿基堆積力 |
D.DNA雙鏈?zhǔn)亲笫致菪?/p> |
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科目:高中生物 來(lái)源: 題型:
It's quite strange that the man sleeps with his mouth____ and his eyes _____.
A. closed; open B. closed; opened C. closing; open D. closing; opening
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This is the school _____ they visited last year and is the one _____ my father once worked.
A. that; where B. where; that C. where; where D. that; that
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When he saw all his books _____ here and there on the floor, he knew that something terrible _____.
A. lying; must have happened B. lie; must happen
C. lay; might have happened D. had lain; could have happen
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