用所给词的适当形式填空

1. --How does John go to school?

   -He usually ____ (walk).

2. It's about ten ____  (kilometer) from my village the town(城镇).

 3. Jane's brother ____ (not take) the subway to school. He usually rides his bike.

 4. Wu Peng needs about twenty-five minutes ____  (get) to school every day.

 5. -How far do you live from your____ (grandparents) home?

   -About four kilometers.

下图甲、乙、丙为组成生物体的相关化合物，乙为一个由α、β、γ三条多肽链形成的蛋白质分子，共含271个氨基酸，图中每条虚线表示由两个硫基(—SH)脱氢形成一个二硫键(—S—S—)。下列相关叙述不正确的是 (   )

从分子的角度分析下列现象．

（1）湿衣服晾干．

（2）一氧化碳有毒，而二氧化碳无毒．

（3）1000L的天然气在加压的情况下可装入10L的钢瓶中．