Key to practice exercise I. GRAMMAR 1.C 2.A在 hope,Ibet结构后的that-分句中可使用一般现在时表示将来的动作。如: bet it rains tomorrow. 3.B.主句中若有 require, demand, suggest insist order, prefer, propose recommend, request等动词,其后的that分句中应使用be型虚拟式,即动次原形或 should+动词原形
6.1 An Introduction to Enzymes 191 H20 in the presence of oxygen is a highly exergonic 6.2 How Enzymes Work 193 process, releasing free energy that we can use to think an I 6.3 Enzyme Kinetics as an Approach to Understanding main on the shelf for years without any obvious con-