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下列各过程中所散失的水分中，主要属于结合水的是[ ]

A．种子收获后在晒干过程中散失的水分

B．干种子在烘烤过程中散失的水分

C．洋葱表皮细胞发生质壁分离所散失的水分

D．植物蒸腾作用散失的水分

答案

答案：B

完形填空

My first roller coaster experience was not pleasant. It was in the summer of 2009, in Six Flags, Massachusetts, the US. I went    小题1:   with a group of friends. We were all very excited about roller coaster   小题2:   waited anxiously for the ride to begin. As the roller coaster got up higher and higher, however, my heart started to beat   小题3:   hard that I even could see my shirt move up and down. I could feel the wind getting stronger and brushing through my hair. Then the big drop came. I closed my eyes and told    小题4:   that it would be over in two seconds, but it felt like forever. I was pushed up from my seat as if I    小题5:  to be thrown out of the car.  小题6:   the time I finished the ride, I could barely stand up or speak. So when my friends asked me    小题7:  I thought of the ride, I just answered with silence. No matter how hard I tried, I could not make    小题8:  sound.
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选择题

制作洋葱鳞片叶表皮细胞临时装片时，必须让盖玻片的一侧先接触液滴，然后再缓缓地盖上，其目的是（　　）

A．增强装片的透明度

B．防止水溢出污染装片

C．避免实验材料移动

D．避免盖玻片下出现气泡
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