1.Mountain climbers challenge the limits of human stamina in their attempts to scale the world's highest peaks.
(A)ability n. 能力，能耐；才能
(B)endurance n. 忍耐力；忍耐；持久；耐久
(C)suffering n. 受难；苦楚
2.A human zygote is no large than a speck of sand,yet it contains a complete blueprint for the maturation of a new person.
(A)swirl n. 漩涡；打旋；涡状形
(B)mound n. 堆；高地；坟堆；护堤
(C)particle n. 颗粒；[物] 质点；极小量；小品词
3.In the 1700's North American colonists proclaimed their wealth and social standing by wearing elaborate stockings.
(A)responsibility n. 责任，职责；义务
(B)events n. (Events)人名；(英)伊文茨
(C)status n. 地位；状态；情形；重要身份
4.When squashed,the stem and leaves of the jewelweed exude a juice that will soothe some skin irrtations.
(A)boiled adj. 煮沸的，煮熟的
(B)aged adj. 年老的；…岁的；老年人特有的
(C)crushed adj. 压碎的，倒碎的
5.Meteorologists issue tornado watches when they become aware of conditions leading to the unusually severe thundeerstorms that spawn tornadoes.
(A)generate vt. 使形成；发生；生殖
(B)outrun vt. 超过；跑得比…快；从…逃脱
(C)accompany vt. 陪伴，伴随；伴奏
6.To conceal itself,an octopus sensing danger will squirt a black fluid through an opening under its head.
(A)strain n. 张力；拉紧；负担；扭伤；血缘
(B)swallow vt. 忍受；吞没
(C)spurt out v. 喷出
答案：BCCC AC
详解：
1.stamina
n. 毅力；精力；活力；持久力
He runs every day to hone his stamina.
为了增强耐力，他每天都进行跑步锻炼。
2.speck
n. 灰尘；污点；小颗粒
Wherever possible — in big stadium or sandlot seats — try to nearly fill the frame with your subject rather than have him or her show up as a distant speck.
在任何地方——不管是大运动场或是运动空地，只要可能，要让你的被摄主体尽量填满画面，而不是让他/她看上去像一个小斑点。
3.standing
n. 站立；持续；身分
Do you see the man standing there?
你看见站在那边的那个人了吗?
4.squashed
adj. 压扁的；压碎的
The bus has exactly 26 seats, which means we all have to sit squashed together.
巴士正好有26个座位，这就意味着我们所有人只能挤在一起。
5.spawn
vt. 产卵；酿成，造成；大量生产
Many sea fishes spawn in rivers.
许多海洋鱼类是在淡水河里产卵的。
6.squirt
n. 喷射；注射
Sperm are worthless. Men are free to waste them, squirt them this way and that.
精子是不值钱的，男人可以通 过各种方式随意的喷射浪费。