NASA's Constellation Programme would be cancelled mainly because______
A.there were more important space missions
B.the space agency lacked funding for the programme
C.the current shuttle missions would continue
D.Congress failed to pass President Obama's budget

未分类题When you have finished with the book, don't forget to return to Tim, ______?A.won't youB.don't youC.will youD.do you

单项选择题乳牙期前牙反 牙合 的矫正年龄一般为 A 1-2岁 B 2-3岁 C 3-6岁 D 6岁以上

未分类题The following are all cited as advantages of e-book EXCEPT______.A.imaginative designB.environmental friendlinessC.convenience for readersD.multimodal content

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

未分类题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（ ）

未分类题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

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