27.If you take sleeping pills for a long time, you will____ them.
A.be addicted to B.be attracted to C.be devoted to D.be exposed to
26.The accident that happened at an oilfield____ the southeast coast of the U.S.A has caused great damage to the environment.
A.away B.from C.off D.beyond
25.It is the discovery of Cao Cao's tomb, _____ was made in Anyang, Henan province, ____ has received widespread attention.
A.where; which B.where; that
C.that; which D.which; that
24.There a trend that 3D films will become more popular ever since the film Avatar hit the market.
A.has arisen B.arose C.is arising D.will arise
23.When _____ a job, you should highlight your experience and skills.
A.applying to B.applied to
C.applying for D.applied for
22.Football fans are always arguing over those ____ goals in the World Cup.
A.confidential B.controversial C.contemporary D.contradictory
34.(7分)下图为某同学利用紫色洋葱表皮作为实验材料,观察植物细胞质壁分离与复原的基本操作步骤。请据图回答:
(1)你认为该实验有无对照实验 (有/无)。
(2)B步骤主要观察洋葱鳞片叶表皮细胞中紫色 的大小以及 (原生质层/原生质体)的位置。
(3)C步骤中吸水纸的作用是 。
(4)在F步骤时,若观察发现质壁分离不能复原,最可能的原因是 。
(5)某同学认为紫色洋葱表皮细胞体积较大,容易观察,还可用于观察染色体数目的变化。你认为该同学实验能否成功? 原因是: 。
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