私醫聯招 英文歷屆試題｜第 323 題
107 學年度
Some scientists are busy (21) genes of animals and plants to create new varieties that are (22) to insects and to herbicides. A new, golden-colored rice, high in Vitamin A is also a product of genetic alteration. (23) these "biotech" varieties seem to offer clear advantages, critics continue to reveal the risks of genetic alteration of foods.
- Unless
- While
- Because
- Whenever
提示
前後兩句語意為對比（優點 vs. 風險），須選表達讓步/對比的連接詞。
正確答案
正解：B
詳解
A. Unless 意為「除非」，表條件關係，與前後文的對比語意不合。
B. While 意為「雖然／然而」，表對比讓步，正好連接「優點」與「風險」兩種對立描述，為正確答案。
C. Because 意為「因為」，表因果關係，與前後句非因果關係不合。
D. Whenever 意為「每當」，表時間關係，語意不合。
