如图所示，模型交流发电机的矩形线圈abcd在匀强磁场中绕垂直于磁场的轴匀速转动，矩形线圈与原线圈可调节的理想变压器、灯泡、平行板电容器组成电路，当矩形线圈转动的角速度为ω时，发现灯泡较暗，不能正常发光，为了使灯泡能正常工作，下列措施可行的是（   ）

《物质构成的奥秘》告诉我们：元素的种类、化学性质分别与下列粒子数密切相关它是（    ）

一只跳蚤在第一象限及x轴、y轴上跳动，在第一秒钟时， 它从原点跳动到(0，1)，然后接着按图中箭头所示方向跳动即(0，0)→(0，1) →(1，1) →（1，0）→…，且每秒跳动 一个单位，那么第35秒时跳蚤所在位置的坐标是（   ）

    As a saying goes, he who doesn't reach the Great Wall is not a true man. The Great Wall in China ____(impress) everyone who sees for the first time ____ the general tourists to scholars. The vastness of the structure helps children grasp the great ____(achieve) in human history and can help inspire them ____ (learn) more about human success over one thousand years.____ (construct) over a period of 2,000 years, the stone solider ____(actual) consists of many great walls, some of____date back to the fifth century B.C. The first emperor of China, Qin Shi Huang,____ (order) these earlier long wall sections linked and extended with watchtowers to protect the new empire from northern tribes. Succeeding emperors and dynasties continued the construction.____ (spread) westward into the Gobi desert to guard____Silk Road. All together, the walls may have stretched more than 30,000 miles.