“化学就在我们身边．”通过一次旅游，某同学对这一观念有了更深的体会．
（1）旅游前，他准备了鸡蛋、面包、桔子和矿泉水，其中富含维生素的是____ .
（2）旅游过程中，他将用过的矿泉水瓶放到了贴有____（填“可回收”或“不可回收”）标识的垃圾箱内．
（3）途经小溪，他取了少量溪水，向其中加入肥皂水，震荡．观察到____现象，说明该溪水为硬水．
（4）进入林区，他能看见的消防安全标志有____（填字母）．

    Our ancestors（祖先）made the old saying that friends____(be) like wine-the older,the better.Because of that, many people think old friends to be____(important) than new ones.For example,if two pieces of advice are given to solve a problem,one from a new friend and the other from an old friend,people always prefer to choose the latter one,____the new friend's advice may be better.

    ____(disagree) with the old saying,I believe that new friends are not____(necessary) worse than old friends. Why?Because the____(long) of time cannot tell whether your friendship is better or not.

    Once you call someone friend,he must be a person who is____(rely) and whose interests are in common with____(you).Maybe a friend's outside look____(change) all the time,but the inside characters of him and his interests won't change at all.It is just these unchangeable characters and interests that make him a friend to you.____,there is no difference between old friends and new ones on this point.

有关太阳辐射及其对地球影响的叙述，正确的是（    ）