全世界各国无论大小都设有警察,但是他们的本质却千差万别。 ( )
参考答案:错
Many students have to______ their hobbies because of their busy school work.
A.stay up
B.put up
C.give up
D.look up
下列哪项不是骨质疏松症的骨骼表现()
A.腰背疼痛或全身骨痛是骨质疏松症的最常见症状
B.骨折的发生可有或无诱因
C.负重能力减弱,活动后常导致肌肉劳损和肌痉挛
D.Ⅰ型(绝经后)原发性骨质疏松症以小梁骨和皮质骨为主,Ⅱ型(老年性)原发性骨质疏松症骨丢失以小梁骨为主
E.Ⅰ型(绝经后)原发性骨质疏松症骨折部位以脊椎骨为主,Ⅱ型(老年性)原发性骨质疏松症骨折部位以脊椎骨和髋部为主