阅读材料，完成下列各题．

材料一：2008年6月20日，国际天文联合会宣布批准将中山大学学生叶泉志发现的161715号小行星命名为“汶川星”，以此悼念在汶川大地震中的罹难者．

材料二：图为“太阳系模式图”

一般固体受热时，在各个方向上的长度都会胀大，在冷却时都会缩小，物体在某一方向上长度的膨胀称为线膨胀。下表是科技小组的同学探究影响物体线膨胀因素的实验记录，请根据实验记录回答问题。

    My mother is a teacher. On weekdays, she gives lessons at school and on Saturdays she works in clubs. On Sundays, she is still busy.

On Sunday morning, mum gets up at six. She cooks breakfast for us first. And then it's time for cleaning. After that, she has breakfast with father and me. At 9, she goes to buy food for lunch in the supermarket. She can have a short rest after lunch. In the afternoon, mum doesn't go out. She helps me with my lessons. She does some reading, too.

    Mother watches TV at about 7 when she finishes (完成) the housework. But at that time she is always tired and falls asleep (睡着) in the sofa sometimes.

依次填入下列横线处的词语，最恰当的一组是(　　)
在被英国用大炮打破国门之前，清朝人对国门外的世界接近________。就连号称第一个“开眼看世界”的林则徐，________对外知之甚少。直到鸦片战争开始前，他还认为英国兵到了陆上就会“一仆不能复起”。而他更是________英国必须购买中国的茶叶和大黄，“外夷若不得此，即无以为命”，统统便秘而死。林则徐尚且如此，当时清朝的普通臣民就________了。