【題目】(2017·天津) My eldest son, ___________ work takes him all over the world, is in New York at the moment.
A. that B. whose C. his D. who
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【題目】
Dress warmly, you'll catch cold You see the flu is spreading quickly, right?
A. on the contrary
B. instead
C. on the other hand
D. or else
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【題目】He has given you the way ____________ is best to solve the problem.
A. / B. in which C. what D. which
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【題目】(2017·北京) Hannah is one of many examples of young people who are making a in the world. You can,too!
A. choice B. profit
C. judgement D. difference
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【題目】The performance was a great success because the orchestra was by an internationally famous conductor.
A. directed
B. performed
C.conducted
D. staged
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【題目】 He was when he lost all his money. Luckily, a kind man helped him generously.
A. desperate B. optimistic C. eager D. cautious
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【題目】 (2017·江蘇) In 1963 the UN set up the World Food Programme, one of ____________ purposes is to relieve worldwide starvation.
A. which B. its C. whose D. whom
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【題目】某同學在做“低溫誘導植物染色體數(shù)目的變化”實驗時,將大蒜根尖隨機分為12組,實驗處理和結(jié)果如下表所示,請回答下列有關(guān)問題:
(1)低溫誘導植物染色體數(shù)目加倍的原理是低溫會使細胞分裂過程中________的形成受阻,從而使細胞分裂過程中染色體數(shù)目加倍而細胞不分裂。低溫處理與秋水仙素處理相比,具有______________等優(yōu)點。
(2)實驗中選擇大蒜根尖________區(qū)細胞進行觀察,效果最佳,原因是此處的細胞分裂比較________,在顯微鏡下觀察,此處細胞的特點表現(xiàn)為________。
(3)實驗過程中需要用________對大蒜根尖細胞的染色體進行染色。
(4)由實驗結(jié)果可知,________的條件下,加倍效果最為明顯。
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