在英语日益重要的今天，学好英语成了大多数学生的首要目标。为帮助大学生高效的学习英语。特收集以下练习：
The converse observation, of the absence of grazers (食草动物)in areas of high phytoPlankton(浮游植物群落)concentration, led Hardy to propose his principle of animal exclusion , which hypothesized that phytoplankton produced a repellent(驱虫剂) that excluded grazers from regions of high phytoplankton concentration.
107. Although these molecules allow radiation at visible at wave lengths, where most of the energy of sunlight is concentrated, to pass through, they absorb some of the longer-wavelength, infrared emission(红外辐射) radiated from the Earth’s surface, radiation that would otherwise be transmitted back into space.
108. In addition, the style of some Black novels, like Jean Toomer’s Cane, verges on expressionism or surrealism(超现实主义), does this technique provide a counter point to the prevalent theme that portrays the fate against which Black heroes are pitted, a theme usually conveyed by more naturalistic modes of expression?
109. Roseenblatt’s thematic analysis permits considerable objectivity; he even explicitly states that it is not his intention to judge the merit of the various works—yet his reluctance seems misplaced, especially since an attempt to appraise might have led to interesting results.
110. Thus, for instance, it may come as a shock to mathematicians to learn that the Schrodinger equation (薛定谔的方程式)for the hydrogen atom is not a literally correct description of this atom, but only an approximation to a somewhat more correct equation taking account of spin, magnetic dipole (磁性偶极子), and relatiristic effects, and that this corrected equation is itself only an imperfect approximation to an infinite set of quantum field theoretical equations( 量子场论方程式).
106、相反的不雅察看，即在浮游植物群落高度集中的处所缺乏食草动物的现象，使哈笛提出了他的“动物解除”理论，该理论假设浮游植物群落能发生一种驱虫剂赶走在浮游植物高度集中区域内的食草动物。
107、尽管这些分子能够经由过程可见光，阳光的大部门热量?都集中在这个波段，可是它们领受长波，从地表来的红外辐射，或者将有些辐赡折射回空中。
108、此外，一些黑人小说的气概，像Jean Toomer的Cane，就接近于默示主义或者超现实主义，这种巧合是否给风行描述黑人主人公与命运匹敌的主题供给了一个反衬点，或者经常被加倍自然的表达模式所传达的主题?
109、Roseenblatt的主题剖析很是有客不美观性，他甚至明晰地说他并不愿判定各类作品的价值—但他的说法似乎有些不合错误头，出格是有时歌咏的考试考试可能发生有趣的结不美观。
110、这样，对于数学家们来说长短常骇怪的，例如，薛定谔方程式并不是氢原子的切确描述，而只是某种水平上的近似值。它近似于此外一种描述磁性偶极子相对效不美观的方程，而这个方程自己又是一套不定量子场论方程的近似值。