比较下列每组数的大小,用“>”“=”或“<”填空. (1) -3________-0.5; (2)+(-0.5)_______+; (3)-8________-12; (4)_______-; (5)-_______-(-3.32). 答案: (1)< (2)< (3)> (4)< (5)<
Many objects that people use each day
started with a simple idea. These objects have often changed the way we
46 . Some help us to do a job more 47 . Others
fill a need or solve a problem.
In 1858, Lipman had such an
48 . He took out a pencil, a piece of paper, 49 an
eraser. Then he began to write. Sometimes he needed to 50 a
word. Each time he had to search under his books and papers to
51 the eraser. “ I wish my eraser would stay in
one 52 !” he said.
Then Lipman had his simple idea. He 53 a
groove(凹槽) in
one end of the pencil. He glued(粘牢) the eraser into the groove. Lipman had solved his problem. Later
he thought that others might like to have such a pencil. So he sold his 54 .Some
pencils with erasers were 55 . His design earned $ 100000.
1.
A.study
B.live
C.sleep
D.walk
2.
A.easily
B.correctly
C.carefully
D.normally
3.
A.article
B.aim
C.idea
D.action
4.
A.so
B.and
C.but
D.as
5.
A.spell
B.read
C.write
D.change
6.
A.look
B.see
C.watch
D.find
7.
A.place
B.desk
C.book
D.hand
8.
A.marked
B.prepared
C.cut
D.invented
9.
A.books
B.pencil
C.design
D.eraser
10.
A.wonderful
B.expensive
C.colourful
D.common