8. The most important chemical catalyst on this planet is chlorophyII, -------------- carbon dioxide and water react to form carbohydrates.
(A) whose presence
(B) Which is present
(C) presenting
(D) in the presence of which
13. In geometry, an ellipse may be defined as the locus of all points ------------- distances from two fixed points is constant.
(A) which as the sum of
(B) of the sum which
(C) whose sum of whose
(D) whose sum that the
32: Despite the fact that lemurs are general nocturnal, the ring-railed lemur travels by day in bands of four to twelve individuals. 我 选 A, 为 什 么 正 确 答 案 是 B, 不 明 白 ?? 请 指 教
请 问 哪 一 个 是 正 确 的 ? 为 什 么 ? 多 谢  |