【单选题】We don’t know _________ with the rubbish and it pollutes out land and sea.
【简答题】请你把下列显微镜的结构及其作用用线连接起来 A物镜和目镜 ①安放物镜 B转换器 ②使镜筒上升或下降 C反光镜 ③调节进入物镜光的多少 D准焦螺旋 ④反射光线 E遮光器 ⑤放大作用.
【单选题】We werethat the Wenchuan earthquake left the whole city in ruins.A.shockedB.worried aboutC.worryi
A.
19.We were that the Wenchuan earthquake left the whole city in ruins. A.shocked
【单选题】We can achieve a win-win result, _____that you are willing to make a concession.
【单选题】We understand you need easy access_____up-to-date information about your accounts in our bank.
【简答题】(8分)回答以下显微镜的结构及操作等问题。 (1)请写出右图引线所指示的显微镜的结构名称。 (2)在观察口腔上皮细胞时,使用目镜是10×,物镜是12.5×,则细胞被放大的倍数是 倍。 若看到的物像不够清晰,应调节 准焦螺旋。操作时若发现镜头上沾有污物,要用 擦拭。 (4)小明观察到物像在显微镜视野的左上角,他把玻片向 方向移动,使物像处于视野中央。
【单选题】We are both looking forward to _____ next week. A. going on vacation
【单选题】We were in such an anxious_____ when we left that we forgot the airline tickets.
【简答题】如图是显微镜结构图及某同学“用显微镜观察人口腔上皮细胞装片”时记录下的A、B、C三幅图象,请认真看图并回答. (1)在使用显微镜进行对光时,应首先使[4]______对准通光孔.若在光线不足的实验室中,应选用反光镜的______面和______光圈. (2)当转动粗准焦螺旋,使镜筒下降时,眼睛应注视的部位是[4]______,以免损坏玻片和______. (3)若使A图象中口腔上皮细胞移至视野的中...