为什么要选 -----The profits of this year have fallen much.-----Yes.It is not unexpected._____,it is very disappointing.A.Besides B.GenerallyC.NeverthelessD.Personally

英文的导数数学题,求步骤,解题过程(1 pt) The total profit (in dollars) from the sale of charcoal grills isP(x)=30x-0.3x^2-215(A) Find the average profit per grill if 40 grills are produced. Ave. profit = Find the marginal average profi listen to the teacher 为什么要the the English前为什么要加the read the book为什么要加the on the farm为什么要加the 英语语法： 为什么要加the英语语法：为什么要加the Look the same为什么要加定冠词the?还有the same as为什么也要加the Of the two pens,the boy bought_expensive one at least.A、the most B、the least C、less D、the less为什么选D?我要理由! the singer and the dancer（）come to Beijing.为什么要选have,而不是are呢? (The Williams) came to our school yesterday.为什么要选The Williams the one in the red is lily为什么要去掉the the one in the red 为什么就对 12 The boys are playing on the ___of the beachA sand B sands C sandes D sandy 为什么选B sand 为什么要加s 为什么The Hong Kong Stadium要加The为什么Sai Kung不加The the story happened _______________ A.in the 1940 B.in the 1940s C.in 1940 D.in the 1940s'为什么选B,1940后面为什么要加S,能不能说明下为什么? There is _old woman in the car A .the B.an为什么选Bin the car 不是作定语修饰old woman吗?为什么不用the?为什么要用an? 帮忙解释一下为什么要这样选（英语）At the sight of the policeman ,_______from behind the door.选的是out rushed the thief. Who jumped _____ hightest of____three?A,the,a B /,the Ca,a D a,the为什么要选B呀,hightest前不应加the吗? lonely are the free ,the silent are the strong 为什么要加the