For a whole month she stayed in the hospital and not once did she visit her home for fear of carrying the ()(infect)to her child.
In 1934 the scientist William Beebe dived 3 , 000 feet below the surface in a hollow steel ball. In 1935 Auguste Piccard dived 10, 330 feet. In 1960 his son Jean dived to a【35】of 35, 800 feet.
All these early dives were deep. But the divers could not stay down for very long. They had to【36】the surface after a few seconds. Scientists needed to stay down longer to study life below the surface.【37】, they succeeded. Cousteau, a Frenchman, was able to【38】down to a depth of【36】feet for one month and to a depth of 90 feet for a week.
Now scientists are developing even【39】equipment. With this new equipment, men can stay【40】the surface for days or【41】weeks. In 1962 Consteau【42】a research station 35 feet below the surface. Then in 1964 he set up another station on the ocean floor of the Red Sea. This was the first undersea station to operate【43】help from the surface.
Many countries are now studying undersea【44】. The Soviet Union has an undersea laboratory in the Crimean Sea. The United States has a laboratory 50 feet【45】on the ocean floor【46】the Virgin Islands. In 1970 five men lived there for two weeks. Then a【47】of five women scientists stayed in the laboratory.【48】came other teams of men. All were there to explore the ocean depths and【49】plans for the use of its resources. Scientists hope to find enough【50】, vegetable, and animal wealth there to provide food for the whole world.
(31)
A.in
B.to
C.on
D.under
March is the third month of_________.
A.a year
B.year
C.years
D.the year
They did not sell a single car for a month and had to______workers.
A.lay down
B.lay behind
C.lay off
D.lay out
In the U. S., at Christmas, schoolchildren have ______ for holiday.
A. a month
B. a week
C. two weeks
D. three weeks
It was last month ______ I took part in the party.
A.that
B.where
C.when
D.不填
By the end of this month, all this ______.
A.is changed
B.had changed
C.will have changed
D.has changed
A.being completed
B.is completed
C.to be completed
D.completed
We have learnt a lot from the ______.
A.three month's training course
B.three-month training course
C.three-month-training course
D.three months training course
We can't go to Swizerland this month but we'll go ______.
A.by and by
B.later and later
C.little by little
D.step by step
A.common
B.unique
C.rare
D.singular
He has been_______ a visit to his teacher each month for many years.
A.paying
B.having
C.doing
D.holding