With his hard work, John ____ the basic knowledge of computer（）
A. has caught
B. has acquired
C. has required
D. has acknowledged
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Tetrachloromethane, CCl4, is a（）
A. polar molecule with polar bonds
B. polar molecule with non-polar bonds
C. non-polar molecule with polar bonds
D. non-polar molecule with non-polar bonds
There were___ for Saturday’s movie（）
A. not available tickets
B. no available
C. no tickets available
D. tickets no available
Which statement about ethanol is correct（）
AIt burns in air to form ethene and water
BIt is prepared from ethene by fermentation
CIt is prepared from glucose in an addition reaction
DIt is the only product when ethene reacts with steam
Which statement about alkenes is not correct（）
A They are hydrocarbons
B They are saturated
C They contain a C=C bond
D They form polymers
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