题目内容
（请给出正确答案）
A.5A
B.2A
C.3A
D.4A
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更多“For the circuit shown, the current out of the battery is 4A , and the current that passes through th…”相关的问题
B．2A
C．3A
D．4A
A、something with extreme cuts
B、something extravagant
C、complicated jackets
D、pant suits
The smallest bat in the world is from Southeast Asia.This kind of bat measures about 30 millimeters in length. The world's largest bat, the Giant Golden-Crowned Flying Fox, has a wingspan of 1.5 meters.Most bats eat insects,but many feed on fruit or nectar from flowers.
Many people think bats are blind,but this is not true.Many species have very good sight.Most bats communicate and find their way by making"echolocation" ( 回声定位法 ) noises.They produce high-frequency noises and can estimate the distance of an object by using the sound echoes that bounce back to them. So, while bats may travel in total darkness, they"see"using sound.
Sadly, bats are widely feared and misunderstood. Most bats come out of their shelters only at nightfall. Three bat species feed on blood. Because of these qualities, bats have long been linked in many cultures to death, darkness and blood-drinking.
Yet bats are important for agriculture and our environment. They help pollinate (授粉)plants and spread seeds. They also help control insects. Bats eat huge numbers of insects,including kinds that damage crops.
For example, a brown bat can eat more than 1,000 insects in one hour.Onereport says bats save American farmers billions of dollars every year by reducing crop damage and limiting the need for chemicals that kill insects.
Over one-fifth of all bat species are under threat. They face disease and the human destruction of their natural environments.In some areas, diseases have killed nearly 100% of bat populations.
第21题 The United Nations declared 2011 to 2012 the Year of the Bat,because bats_____.
A.are beneficial animals B.are close to extinction
C.have been misunderstood D.are under serious threat
第22题 Bats can fly in total darkness, because_____.
A.their eye sight is extremely sharp
B.they can fly without using their sight
C.they don't have eye sight in daytime
D.they are very familiar with their environment
第23题 Many people fear bats because_____.
A.many cultures connect bats with unpleasant things
B.bats are very ugly in appearance
C.bats are thought to be blind
D.bats carry deadly diseases with them
第24题 It can be concluded that_____.
A.bats are more easily to be killed by diseases
B.bat population has been reduced sharply these days
C.bats can help farmers save crops and money
D.bats' living environment has been mostly destroyed
第25题 The word" nectar" in the second paragraph probably means_____.
A.the flowers' eyes B.the flowers' leaves
C.the smell produced by flowers D.the liquid produced by flowers
A、purchased by
B、purchased for
C、persuaded from
D、persuaded for
A、chart
B、recover
C、prepare
D、render
B．②③
C．①③
D．①②③
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