判断题 改善旅游接待地原住民的生活质量是旅游业可持续发展的目标之一。 正确 错误

未知题型 Which of the following interpretations of the biologists' theory about melatonin is INCORRECT?A.The production of melatonin in our bodies varies at different times.B.Melatonin is more likely to cause sleepiness in our bodies.C.The reduction of melatonin will cause wakefulness in our bodies.D.The amount of melatonin remains constant in our bodies.

单项选择题 紧急呼叫(SOS)需要进行附着以后才能发起的网络服务（ ）

未知题型 Which of the following can best sum up the author's overall reaction to her adult son's positive response to spring cleaning?A.Surprised and skeptical.B.Elated and hesitant.C.Relieved and optimistiC.D.Optimistic and hesitant.

单项选择题 一组数据的分布曲线呈双峰状态，据此可以推测该组数据中可能有两个（2012年全国统考） A、中数 B、众数 C、平均数 D、几何平均数

未知题型 选择之债中的选择权，如当事人无另外的约定或法律无特别的规定，则原则上属于（）。

单项选择题 以下哪些不是交流传动技术的优点 A、功率因数高 B、电机体积、重量小 C、控制技术简单 D、电制动能量可以回馈电网

单项选择题 不属于法洛四联症畸形组成的是 A、肺动脉狭窄 B、室间隔缺损 C、主动脉骑跨 D、右心室肥大 E、房间隔缺损

未知题型 听力原文： The train I was traveling on was already half an hour latE.I had planned to arrive in Chicago at 7:00 in time to catch the 7:50 train to St. Louis, but there was no hope of that now. I explained the situation to the conductor who advised me to get off before Union Station and take a taxi. When the time came, he even helped me with my languagE.He wished mea good luck as I jumped off, and a few minutes later I was going towards the Union Station in a taxi. It was almost 7:50 when we stopped outside the station, I paid the driver quickly, carried my bags and hurried insidE.'The St. Louis train....'?' was all I had time to say to the first porter I saw. You can imagine my disappointment when he pointed to a train that was just moving out of the station.When did the train he was travelling on arrive in Chicago?A.At 7:00.B.At 7:50.C.In timE.D.Behind its timE.

未知题型 甲方在2月1日写好要约，但在2月3日才发出。甲方写的要约没有日期，到了2月10日才由邮局投到乙方的信箱。乙方11日才打开邮箱，看到要约。甲方规定的承诺期是15天。承诺期从何时计算（）