题型:句型转换 Change the sentences into questions. (就画线部分提问)例: She is doing the dishes What is she doing?1. His grandparents are sleeping. 2. Her uncle is writing a letter. 3. We are eating dinner. 4. They are listening to music. 查看答案
题型:单项选择题 关于大气中的空气离子,下列说法正确的是()。A.新鲜的清洁空气中轻离子浓度低B.污染的空气中轻离子浓度低C.空气阳离子对机体有镇静、催眠和降压作用D.空气阴离子可引起失眠、烦躁和血压升高E.空气阳离子与阴离子对机体的作用相同 查看答案
题型:单项选择题 膝关节积液的声像图特征不包括A.关节腔增宽,内为无回声区B.髌上间隙内有无回声区 C.髌前囊内有无回声区 D.病程较长时,关节滑膜增厚 E.半月板内两个强回声界面间呈一低回声带 查看答案