He his bike to the bus station. [ ]
A. riding
B. takes
C. rides
D. gets
答案:C
以锂为负极的原电池
主要依靠祁连山的冰雪融水或地下水提供灌溉水源的是[ ]
A、成都平原
B、河西走廊
C、宁夏平原
D、河套平原