【题目】(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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【题目】
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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【题目】He has given you the way ____________ is best to solve the problem.
A. / B. in which C. what D. which
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【题目】(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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【题目】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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【题目】 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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【题目】 (2017·江苏) 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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【题目】某同学在做“低温诱导植物染色体数目的变化”实验时,将大蒜根尖随机分为12组,实验处理和结果如下表所示,请回答下列有关问题:
(1)低温诱导植物染色体数目加倍的原理是低温会使细胞分裂过程中________的形成受阻,从而使细胞分裂过程中染色体数目加倍而细胞不分裂。低温处理与秋水仙素处理相比,具有______________等优点。
(2)实验中选择大蒜根尖________区细胞进行观察,效果最佳,原因是此处的细胞分裂比较________,在显微镜下观察,此处细胞的特点表现为________。
(3)实验过程中需要用________对大蒜根尖细胞的染色体进行染色。
(4)由实验结果可知,________的条件下,加倍效果最为明显。
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