环境学家关注保护濒临灭绝的动物的高昂费用，提出应通过评估各种濒临灭绝的动物对人类的价值，以决定保护哪些动物。此法实际不可行 因为，预言一种动物未来的价值是不可能的。评价对人类现在作出间接但很重要贡献的动物的价值也是不可能的。 从这段文字中可以推出的是()。
A．保护对人类有直接价值的动物远比保护有间接价值的动物重要
B．保护没有价值的濒临灭绝的动物比保护有潜在价值的动物更重要
C．尽管保护所有濒临灭绝的动物是必须的，但在经济上却是不可行的
D．由于判断动物对人类价值高低的方法并不完善，在此基础上作出的决定也不可靠
参考答案：D
解析：【解析】从题干中可知，动物的价值并不能简单地判定，所以A、B的说法都是不正确的，同时题中只强调保护濒临灭绝动物需要高额费用，并没有说支付这些费用是不可行的，故C项错误。
Sheila bought a new lunch bag for school. On the way to school, she looked inside. She hoped that a new lunch bag meant something new for lunch, 16 she found the same lunch as always---a sandwich. When the lunch bell rang. Sheila found her bag and carried it to the dining hall. She opened it and 17 two pieces of fried chicken, several strawberries, and an egg. “Wow!” Sheila said, “That’s what I call 18 !” The next morning, Sheila opened her lunch bag and looked inside. Sure enough, she found another 19 . But when she opened the bag at lunchtime in the dining hall, she discovered a piece of pizza, an orange, and a cake. “My lunch bag 20 be magic,” Sheila said. “There’s no such thing as magic,” her friend Douglas 21 . “There is,” Sheila said. “My mother 22 packs me a sandwich. But ever since I got this new lunch bag, the sandwich has changed into something I like.” “Maybe your mother’s packing 23 things for a change.” “No,” Sheila said. “I checked in the morning. The sandwich changes 24 .” “You are not the 25 one with a magic lunch bag,” Beatrice said, turning around from the table behind her. “I have one, too. See? This is my magic bag.” “Hey,” Sheila said. “My lunch bag really looks like yours.” “Mine is magic,” said Beatrice. “Every day my dad 26 leftovers(剩饭), but at lunchtime I find a sandwich---my favorite!” Sheila started 27 . “What’s so funny?” Beatrice asked. “That’s the sandwich my mother packs,” Sheila said. “We’ve been getting our lunch bags 28 up.” Sheila and 29 shared their lunches every day after that. Sheila loved making new discoveries each time she opened her lunch bag. But her best discovery was magically finding a new 30 .
|