题目内容：

Some bats sing just as birds and humans do. But how they learn their calls and melodies is a mystery—one that scientists will try to solve by researching the genes of more than 1,000 bat species.

The project, called Bat 1K, was announced on 14 November at the annual meeting of the Society for Neuroscience in San Diego, California. Its organizers also hope to learn more about the flying mammals’ echolocation ability—the ability to find directions in the dark; their strong immune systems that can defend against Ebola, a deadly virus; and their relatively long lifespans.

“The genomes of all these other species, like birds and mice, are well-understood,” says an expert at the Max Planck Institute for Psycholinguistics in Nijmegen, the Netherlands. “But we don’t know anything about bat genes yet.”

Some bats show babbling behavior, including barks, chatter, screeches, whistles and trills, says Mirjam Knörnschild, a behavioral ecologist at the Free University of Berlin. Young bats learn the songs and other sounds from older male tutors. They use these sounds during courtship and mating, when they seek food and as they defend their territory against rivals.

Scientists have studied the vocal sounds of only about 50 bat species so far, Knörnschild says, and they know much less about bats’ communication than birds’. Four species of bat have so far been found to learn vocal sounds from each other, their fathers and other adult males, just as a child gradually learns how to speak from its parents.

Genetic studies have discovered at least one gene in bats that is linked to speech and language, called FOXP2. The gene is also known to have a role in how people learn language, and in vocal learning in song-birds. Researchers working on the Bat 1K project expect to find that other genes are also involved in communication, and that many more bat species have the ability to learn songs, calls and other sounds. “It’s not a rare trait,” Knörnschild says. “I’m becoming convinced that all bats are more or less the same in vocal learning.”

Bats’ echolocation ability has been studied for many years, partly because of its applications to sonar and radar. But scientists know very little about the vocal communication and social behaviour that drive how bats learn their songs and sounds, says Michael Yartsev, a neurobiologist at University of California, Berkeley. The study of vocal learning in bats is “nearly completely untapped”, he says—comparing it to the state of research into birdsong 60 years ago.

1.The project, Bat 1K is carried out mainly to ________.

A. do research on the genes of more bat species

B. research bats’ ability to find directions in the dark

C. study the way bats learn their calls and songs

D. learn more secrets about bats’ longer lifespans

2.From Para 5 and 6, we can safely infer that ________.

A. scientists have studied only approximately 50 bat species so far

B. of all bats, only four species learn vocal sounds from each other

C. more than one gene linked to speech and language has been discovered

D. the gene FOXP2 has something to do with human language learning

3.Which of the following is the word “trait” in Paragraph 6 closest to in meaning?

A. quality    B. behavior    C. habit    D. gene

4.What’s the main idea of the passage?

A. Scientists try to know more about bat genes.

B. Scientists seek keys to bats’ vocal sounds.

C. All bats are almost the same in vocal learning.

D. Bats sing just as birds and human beings do.