题目

—How are you getting along with your project? —I was about to give up when an idea occurred to me ________ I could work with my roommate Tim. A．that  B．how C．why   D．whether 答案：A解析：从句I could work with my roommate Tim 句意完整，不缺少成分，因此使用that 引导同位语从句，解释说明idea 的内容。下列说法不正确的是（ ）A．H+H→He+n是聚变B．U+n→Xe+Sr+2n是裂变C．Ra→Rn+He是α衰变D．Na→Mg+e是裂变