“most striking” (line 3, paragraph 1)
“variation is adaptive” (line 2, paragraph 2)
“mechanically disadvantageous” (line 7, paragraph 3)
“evolutionary red herring” (line 8-9, paragraph 4)
第1题：
Which of the following best defines the word "aggressive" ( Line 3, Paragraph 6) ?
A) Bold.
B) Harmful.
C) Careless.
D) Desperate.
第2题：
Which of the following best defines the word \"aggressive\" (line 4, paragraph 7)?
A Bold.
B Harmful.
C Careless.
D Desperate.
第3题：
In line 2 (Pare. 2), the word "it" refers to which of the following phrases?
A. "the intention" (line 1)
B. "the collection" (line 1)
C. "one member" (line 1)
D. "each flower family" (line 1)
34．答案为B。此处考察代词的指代用法。It指前一句的表语从句，to have the collection represent at least one member of each flower family native to the United States。
第4题：
第5题：
第6题：
Which of the following sentences from the text BEST indicates that the teacher is very considerate?
A. In her calm，motherly voice she said，“By the end of winter，…”（Paragraph 2）
B. With the grace that only experience can bring，she struggled to…（Paragraph 4）
C. …. she still managed to look both helpful and interested. （Paragraph 4）
D. …，she managed to act as though I wasn’t an annoying little girl.（Paragraph 4）
第7题：
第8题：
The word “devastating” (Line 3, Paragraph 2) is closest in meaning to _____
［A］ destructive ［B］ regretful ［C］ frustrating ［D］ terrible
本题考查词义理解。“devastating”一词出现在第二段末句，形容最近发生在联合国办事处的汽车炸弹爆炸事件的特点。该句指出，美国官员逐渐认识到过度分散的美国军队已无力独自承担防止这种事件的发生。第一段提到这类爆炸事件时，用了“策划日益精密（increasingly sophisticated）”来形容。由此可见，这类爆炸事件是极具破坏性的，因此引起了美国当局的极大重视。［A］正确，［D］表达含义太泛。
第9题：
第10题：
Why are Japanese starry flounder mostly left-eyed?
Why should the eye-sidedness in starry flounder be considered selectively neutral?
Why have biologists recently become interested in whether a characteristic is adaptive or selectively neutral?
How do the eyes in flatfish migrate?