向氧化铜和铁粉的混合物中加入一定量的稀硫酸，微热，充分反应后过滤，向滤液中插入锌片，有气泡产生。则以下判断不正确的是（    ）

阅读下列短文，从文后各题所给的四个选项中选出一个最佳答案。

    Joe Azougar was walking his dog when a bear appeared suddenly.

   "When it came up, the first thing my dog did was1  me and attack the bear, " Azougar said from his 2 in Lady Minto Hospital.

    Then Azougar ran into his house and began to3  his neighbors, warning them what was going on."As I looked around I saw the bear pull my dog into the 4. And to my great sadness, the dog waskilled," he said.

    Then suddenly, the bear 5 and it broke through the house's back window. Azougar began throwing things at the bear and making loud noises. Then he stoodon a chair to make himself look much 6.

    "It seemed as if the bear was very 7 ,  said Azougar.“I thought my best chance was to run outside  8 someone could find me."

    Azougar began running，but the bear  9  him.

    "It had four paws on top of me," he said.“Then, it  10  my body and tried to bite my stomach. That gave me just a few 11  to turn into and protect my head."

    The bear began to pull Azougar's body. “By that time I could feel my body becoming  12," Azougar said.

    Luckily, two women, who were13 , saved him. Their car was such a（n） 14  thing in the bear's eyes, that it ran quickly into the woods.

    "I am just thankful to those two angels that saved me in time," he said.

    People, who have lived here for 20 or 30 years, said they had  15 seenanything like this," said Azougar. He is the first one, and he hopes that he will be also the last one. "Now I'm planning to move somewhere else once I come out of hospital."

阅读《沙漠里的奇怪现象》中的文字，完成下面题目。
在沙漠里不但光线会作怪，声音也会作怪。唐玄奘相信这是魔鬼在迷人，直到如今，住在沙漠中的人们还有相信的。群众把会发出声音的沙地称为“鸣沙”。现在宁夏回族自治区中卫县靠黄河有一个地方叫鸣沙山，即沙坡头地方，科学院和铁道部等机关在此设有治沙站。站的后面便是腾格里沙漠。沙漠在此处已紧逼黄河河岸，沙高约一百米，沙坡面南座北，中呈凹形，有很多泉水涌出。这块沙地向来是人们崇拜的对象。据说，每逢农历端阳节，男男女女便在鸣沙山上聚会，然后纷纷顺着山坡翻滚下来。这时候沙便发出轰隆的巨响，像打雷一样。两年前我和五、六个同志曾经走到这鸣沙山顶上慢慢滚下来，果然听到隆隆之声，好像远处汽车在行走似的。据一些专家的意见，只要沙漠面部的沙子是细沙而干燥，含有大量石英，被太阳晒得火热后，经风的吹拂或人马的走动，沙粒移动摩擦起来便会发出声音，这便是鸣沙，古人说：“见怪不怪，其怪自败。”沙漠里的一切怪异现象，其实都是可以用科学道理来说明的。