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【简答题】
溶解氧的测定有何环境意义?碘量法和膜电极法测定溶解氧的原理各是什么?各有何特点?应注意哪些干扰因素?如何消除?
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举一反三
【单选题】Adults sometimes envy children who play all the time ______ they themselves have to work, rain or shine.
A.
while
B.
once
C.
since
D.
though
【单选题】What does the underlined sentence “which adults sometimes frown upon” in the 4th paragraph mean ?
A.
Some adults don’t understand the sports.
B.
Some adults are impatient with kids.
C.
Adults consider it dangerous to go skating or skateboarding.
D.
Some adults think them related to bad behaviors.
【单选题】They could sometimes terrify adults.
A.
They could break pp's legs.
B.
They could sometimes terrify adults.
C.
They could fly against a strong wind.
D.
They could knock pp unconscious.
【单选题】Sometimes even adults can’t right wrong.
A.
tell; between
B.
say; between
C.
tell; from
D.
speak; from
【简答题】阅读理解. Drinking alcohol(酒精)is erous for kids and s and sometimes for s, too. Alcohol is a drug, and it is the drug most abused by s. Many kids have their first drink at an early age, a...
【单选题】When a chopstick is partly put into a glass of water, it looks as if it ______ ．
A.
breaks
B.
were broken
C.
are broken
D.
is broken
【单选题】All the world is( )three parts – finger-feeders, chopstick-feeders, and fork-feeders.
A.
fall into
B.
separate from
C.
broken up
D.
divided into
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