dense fog and high humidity
gusty winds，thunder，rain or hail，and lightning
clear skies with the approach of a cold front
a rapid drop in barometric pressure followed by darkness
第1题：
Animal research is irrelevant to our health and it can often produce______(mislead)results.
第2题：
Cumulonimbus clouds are most likely to accompany a(n) ______.
A.high pressure system
B.cold front
C.warm front
D.occluded front
第3题：
Sperm whales can produce stronger ultrasonic waves to kill their prey than dolphins.
A．Right
B．Wrong
C．Not mentioned
第4题：
Cumulus clouds that have undergone vertical development and have become cumulonimbus in form，indicate ______．
A.clearing weather
B.that a warm front has passed
C.probable thunderstorm activity
D.an approaching hurricane or typhoon
第5题：
The first indications a mariner will have of the approach of a warm front will be ______.
A.large cumulonimbus (thunderclouds) building up
B.high cirrus clouds gradually changing to cirrostratus and then to altostratus
C.fog caused by the warm air passing over the cooler water
D.low dark clouds accompanied by intermittent rain
第6题：
A.can use
B. can be used
C.is to use
D. is using
第7题：
Why do we use the weather satellites to take pictures of the atmosphere?Because______．
A．the weather satellites can do it easily
B．clouds form. there
C．the weather forms there
D．the pictures can forecast the weather
第8题：
The reintroducing experience three years ago shows that man-raised parrots ______.
A. can find their way back home in Jersey
B. are unable to recognize their parents
C. are unable to adapt to the wild
D. can produce a new species
第9题：
The dense black cumulonimbus clouds surrounding the eye of a hurricane are called ______．
A.Spiral rainbands
B.Cloud walls
C.Funnel clouds
D.Cyclonic spirals
第10题：
Cumulonimbus clouds can produce ______.
A.dense fog and high humidity
B.gusty winds, thunder, rain or hail, and lighting
C.clear skies with the approach of a cold front
D.a rapid drop in barometric pressure followed by darkness