问题
单项选择题
利用渗透作用实验原理可以测定细胞液浓度的大致范围。将细胞液浓度相同的某种植物细胞(如左图所示),置于不同浓度的蔗糖溶液中,出现右侧a~d四种细胞状态,则细胞液浓度位于下列哪两个细胞之间()
A.c~b
B.a~c
C.a~d
D.d~c
答案
参考答案:D
利用渗透作用实验原理可以测定细胞液浓度的大致范围。将细胞液浓度相同的某种植物细胞(如左图所示),置于不同浓度的蔗糖溶液中,出现右侧a~d四种细胞状态,则细胞液浓度位于下列哪两个细胞之间()
A.c~b
B.a~c
C.a~d
D.d~c
参考答案:D
Not long ago, I made up my mind to read a lot of books to get more knowledge. So I went to the library and __36___ happily with several books. But after a few days, I felt impatient. The ___37__ of finishing all of them seemed impossible, because I always found it hard to ___38__ down to read a whole book. I didn’t know what to do with it. Then ___39___ one day I thought of “Why not make reading for fun?” it gave me __40___ again. Reading is a journey of spirit. Every time we read a book, we are actually(事实上) talking ___41___ the writer. I tried to put all my effort into his or her books, __42___ I could feel all of his or her happiness and sadness. Now books have become a part of my life. Attitude (态度) can make a great ___43___. Someone once said, “Even though the situation is bad, people still have one freedom(自由) to __44___ their attitude.” So, don’t complain about study or work. It helps __45___. Try to see things from a different way. I’m sure this will change the situation and help you a lot.
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