【单选题】
If a substance is dissolved in water or heated, it
may ____ a gas.
①
give into
②
give over
③
give off
④
give away
【单选题】
13.Oil floats if you ______it on water.
①
will pour
②
are going to pour
③
pour
④
poured
【单选题】
Water_________ both by man and other living things.
①
was needed
②
is needed
③
needs
④
are needed
【单选题】
Oil []which is lighter than water, rises to the surface.
①
comma
②
dash
③
brackets
④
semicolon
【单选题】
The last time we had great fun was [] we were visiting the Water Park.
①
where
②
how
③
when
④
why
【单选题】
4. This kind of plant ____ a lot of water at all times.
①
assumes
②
limits
③
produces
④
requires
【单选题】
19. Water will continue to be ____ it is today —next in importance to oxygen.
①
how
②
Which
③
as
④
what