静水中任一点各方向的压强大小(),方向都()并()作用面的。
参考答案:相等;垂直;指向
Mr Jones was a millionaire(百万富翁). One day he went to stay at a hotel in New York. He hoped to have the cheapest room to live in. Mr Jones asked, "What price(价格) is the room?". The boss (老板) told him. "And which floor is it on?" Again the boss told him. "Is that the cheapest room you have? I' m staying here by myself and only need a small room. "
The boss said, "That room is the smallest and cheapest we have. But why do you choose a poor room like that? When your son stays here, he always stays at our dearest room. Yours is the cheapest. " "Yes," said Mr Jones, "his father is a very rich man, but mine isn' t. "
小题1:Mr Jones was a _________。
A.rich man
B.writer `
C.worker
D.farmer小题2:Mr Jones wanted to have_________ room to live in.
A.a beautiful
B.a dear
C.the cheapest
D.a larger小题3:The boss told Mr Jones that they had_________ room.
A.no the cheapest
B.the cheapest
C.no the dearest
D.no small小题4:Mr Jones' son often stays at _________room.
A.the smallest
B.a cheap
C.a small
D.the dearest小题5:Mr Jones was born (出生) in a _________family.
A.rich
B.big
C.poor
D.a farmer's
下列食物链中正确的是
A.蝉→螳螂→黄雀→细菌
B.蝉→螳螂→黄雀
C.树木→蝉→螳螂→黄雀
D.树木→蝉→螳螂→黄雀→细菌