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標(biāo)題：Build a campus garden

變化：A student wrote a letter to campus newspaper suggesting to make a campus garden for 2 reasons. (A) Students can relax with flowers and trees (B) there is an empty land behind the scientist buildings which is suitable for being a garden

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態(tài)度：The guy disagrees

原因1：It's cold for most of time here. Only blooming time for plants is summer break.During rest of time when campus is full, the flowers can't grow, the campus garden is meaningless.

原因2：The empty land is gonna be used to expand the scientist buildings

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標(biāo)題：Convergent evolution，趨同進(jìn)化

定義：生活在不同地方的生物會(huì)因?yàn)橄嗨频沫h(huán)境進(jìn)化出相似的特點(diǎn)

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例子：Lecture 中講了兩種食蟻獸生物，一種住在非洲，一種住在澳大利亞，它們吃同一種昆蟲，這種昆蟲生活的地方很隱秘。而盡管這兩種昆蟲生活在完全不同的地方，它們都進(jìn)化出了 large, sticky tongues 以幫助它們獲取這種昆蟲作為食物。

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問題：the girl has a time confliction between    her tutoring program and her history class this semester

解決方案1：change her history class to next semester

優(yōu)點(diǎn) 1：can continue her tutoring program
缺點(diǎn) 1：next semester the history class will change from ancient to    modern, which she’s not interested in

解決方案 2：ask    her classmates from math class to help her out

優(yōu)點(diǎn) 2：she    can take history classes this semester
缺點(diǎn) 2：she    cannot keep tutoring kids math anymore

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話題：把一些物種從一個(gè)地方移到另一個(gè)地方可能會(huì)對(duì)當(dāng)?shù)氐奈锓N產(chǎn)生一些不好的結(jié)果

要點(diǎn) 1：樹長(zhǎng)的太高大會(huì)擋住其他樹木接收陽光
例子 1：有一種名為 A 的樹長(zhǎng)得很高大，但是卻擋住了陽光，這樣影響了比它矮小的植物進(jìn)行光合作用，對(duì)生長(zhǎng)不利。

要點(diǎn) 2：有些樹木會(huì)繁殖過快，導(dǎo)致物種入侵。
例子 2：有一種名為 B 的樹，能夠在很短的時(shí)間內(nèi)繁殖，因此成為了外來入侵者，占領(lǐng)了很多本土植物的土地，影響其生存。