藏族妇女素以长发为美,但高原多变的天气和频繁的风沙,使满头秀发很难长时间保持整洁。为保持长发的清洁和整齐,藏族妇女发明了()。
A.毡帽
B.盖头
C.辫套
D.皮帽
参考答案:C
The problem of global warming is serious. _____ , the sea levels have _____a little. [ ]
A. As a consequence; risen
B. On the contrary; arisen
C. On the other hand; arisen
D. In other words; risen
在图所示的各电路中,开头S闭合后,小灯泡L1、L2都能发光的图是:[ ]
A.
B.
C.
D.