问题 选择题

随着人们生活质量的提高,废电池必须进行集中处理的问题被提到议事日程.主要原因是:(  )

A.利用废电池外壳的金属

B.防治废电池中镉、铅等重金属离子对土壤和水源的污染

C.不让废电池中渗出的电解液腐蚀其它物品

D.回收其中的石墨电极

答案

废电池中含有大量的重金属,如锌、铅、镉、汞、锰等.据专家测试,一粒纽扣电池能污染600立方米水.一节一号电池烂在地里,能使一平方米的土地失去利用价值.废旧电池如果与生活垃圾混合处理,电池腐烂后,其中的汞、镉、铅、镍等重金属溶出会污染地下水和土壤.在微生物的作用下,再进入鱼类、农作物中,通过食物链最终进入人体,威胁人类的健康.人如果汞中毒,会患中枢神经疾病,死亡率高达40%;铅能造成神经紊乱、肾炎等;镉主要造成肾损伤以及骨疾-骨质疏松、软骨症及骨折,镉元素,还被被定为致癌物质.因此对废旧电池进行回收利用,集中处理的主要原因是防治废电池中镉、铅等重金属离子对土壤和水源的污染.

故选B.

完形填空

综合填空(本大题共10小题,每小题1分,共10分)

根据短文内容及首字母提示,填写所缺单词,使短文意思完整,没空限填一词。

On July2, 1937, Amelia Earhart( an American pilot) and Fred Noonan left New Guinea for Howland Island in the Pacific. This was the longest and most dangerous part of their t 小题1:   around the world. Earhart had trouble soon after the plane took off. The weather was very bad, so she had to f小题2: at 3,000 metres. Going this high, the plane used fuel quickly.

After about 20 h  小题3: , Earhart and Noonan got close to Howland Island. The island was o 小题4: about 65 miles (英里) away, but the bright sun was shining in their faces so they couldn’t see it. Near Howland, a ship was w 小题5:  for the plane. Earhart contacted the ship: “We don’t have enough fuel,” she said. The ship tried to stay in touch with her b 小题6:  got no answer. Finally, the ship called for help. People looked for Earhart and Noonan for days. However, they found nothing.

What happened to Amelia Earhart? No one knows for sure. D 小题7:  the flight, she probably moved in the wrong direction(方向) because the sun was bright and it was d 小题8:  to see. So she got lost; soon after, her plane ran out of fuel, and she died at sea. Another idea is that she survived(幸存) the plane crash(飞机失事), s 小题9:  to a lonely island, and later died there. Still other think she survived the crash and secretly returned to the U.S. with a new identity(身份).

Till now, none of these i 小题10:  has been proved. People are still wondering about them. (Noonan’s body has never been found either.) No matter what happened, Earhart probably died as she wished. “When I go,” she said, “I’d like best to go in my plane.”

单项选择题 A1型题