问题
单项选择题
细胞的骨架系统是由一系列特异的（）构成的网架系统。
A、结构蛋白质
B、功能蛋白质
C、糖蛋白
D、脂蛋白
答案
参考答案：A
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细胞的骨架系统是由一系列特异的（）构成的网架系统。
A、结构蛋白质
B、功能蛋白质
C、糖蛋白
D、脂蛋白
参考答案：A
It had been a tiring day and I was looking forward to a quiet evening. My husband wouldn’t come back until late and I had 16 to sit down in a comfortable armchair in the living room and read a book. I 17 the children to bed early and 18 a cold supper and some coffee. Soon I was sitting comfortably with a plate 19 with food before me and a book at my side. I was just beginning to eat when the telephone rang. I put down my knife and fork and hurried to 20 it. By the time I got back to the living room, my coffee 21 cold. After I finished my 22 I began to drink my coffee with my book 23 at page one. Suddenly there was a 24 at the door. It gave me such a great surprise that I spilt the 25 and made an ugly stain（污迹）on my skirt. Some stranger had got 26 and wanted me to show him the way. It 27 ages to get rid of him. At last I 28 to sit down again and actually read a whole page without any more interruption until the baby woke up. He began crying loudly and I rushed upstairs. The baby was 29 awake at eleven o'clock when my husband came home. I should have cried myself when he asked me if I had a(n) 30 evening！
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