B．Its ocean adds to people's excitement about life beyond the earth.

　　C．It will be used by NASA as a base for the Hubble telescope.

　　D．Its liquid ocean was first proved by the Galileo spacecraft.

　　22．Which of the following best describes the writer's attitude towards Hubble?

　　A．Cautious.

　　B．Doubtful.

　　23．What does the underlined part in Paragraph 6 mean?

　　A．An underground ocean has been found in Europa.

　　B．The presence of an underground ocean in Europa is not possible.

　　C．It is now certain that there is an ocean on Europa.

　　D．No evidence has shown the existence of an ocean on Europa.

　　24．What type of writing does this passage belong to?

　　A．A term essay.

　　B．A news report.

　　D．An exploration review.

　　B

　　While every dog owner knows his dog can read his moods perfectly, scientists have always been a little doubtful.Now thanks to some researchers at the University of Veterinary Medicine in Vienna, Austria, we finally have some convincing evidence.

　　For their study, biologist Corson Miller and his team exposed eleven selected dogs to digital images of women that were either angry or happy.Half the dogs were rewarded for touching the screen when showing a happy face, while the other half given their treat for selecting those that appeared angry.

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