01.14号作业: OG11(黄皮) CR-117 Caterpillars of all species produce an identical hormone called “juvenile hormone” that maintains feeding behavior. Only when a caterpillar has grown to the right size for pupation to take place does a special enzyme halt the production of juvenile hormone. This enzyme can be synthesized and will, on being ingested by immature caterpillars, kill them by stopping them from feeding.Which of the following, if true, most strongly supports the view that it would NOT be advisable to try to eradicate agricultural pests that go through a caterpillar stage by spraying croplands with the enzyme mentioned above? (A) Most species of caterpillar are subject to some natural predation. (B) Many agricultural pests do not go through a caterpillar stage. (C) Many agriculturally beneficial insects go through a caterpillar stage. (D) Since caterpillars of different species emerge at different times, several sprayings would be necessary. (E) Although the enzyme has been synthesized in the laboratory, no large-scale production facilities exist as yet. 这题好几个单词不认识,虽然选项没有设置太大的难度,但是花的时间太多.顺便问一下,on being ingested by immature caterpillars,为什么要用介词on? CR-119 Adult female rats who have never before encountered rat pups will start to show maternal behaviors after being confined with a pup for about seven days. This period can be considerably shortened by disabling the female’s sense of smell or by removing the scent-producing glands of the pup. Which of the following hypotheses best explains the contrast described above? (A) The sense of smell in adult female rats is more acute than that in rat pups. (B) The amount of scent produced by rat pups increases when they are in the presence of a female rat that did not bear them. (C) Female rats that have given birth are more affected by olfactory cues than are female rats that have never given birth. (D) A female rat that has given birth shows maternal behavior toward rat pups that she did not bear more quickly than does a female rat that has never given birth. (E) The development of a female rat’s maternal interest in a rat pup that she did not bear is inhibited by the odor of the pup. 想多了^_^,误以为B选项是说当幼鼠碰到不是生育它的成年鼠时,就会放出更强的气味,象黄鼠狼对付敌人那样. OG11(黄皮)阅读 RC-41) B选项qualified acceptance 粗心地将它理解为“高质量(完全)地接受”了,而实际意思是“有限制,有保留地接受”。 |