[多项选择]

Alarm Signal

Animal alarm calls and cries can, in fact, serve at least two distinct purposes. The first, obviously, is to warn other members of the group about the presence of predators or perceived dangers. Among some animals, these can be quite specialized. The African meerkat, for example, uses different cries for hawks and for snakes. The other purpose, a little humorously, is to drive away other group members so that the alarm-giving animal can enjoy lone access to a food source. Here the animal relies on its fellows’ instinctual response to flee at the sound of an alarm without stopping to see if danger is actually present.
Question: Explain how the two purposes of alarm calls mentioned in the lecture demonstrate the reading passage.
Now hear a talk on the same subject.

[单项选择]

If phone calls and web pages can be beamed through the air to portable devices, then why not electrical power, too It is a question many consumers and device manufacturers have been asking themselves for some time. But to seasoned observers of the electronics industry, the promise of wireless recharging sounds depressingly familiar. In 2004 Splashpower, a British technology firm, was citing “very strong” interest from consumer-electronics firms for its wireless charging pad. Based on the principle of electromagnetic induction (EMI) that Faraday had discovered in the 19th century, the company’s “Splashpad” contained a coil that generated a magnetic field when a current flowed through it. When a mobile device containing a corresponding coil was brought near the pad, the process was reversed as the magnetic field generated a current in the second coil, charging the device’ s battery without the use of wires. Unfortunately, although Faraday’s
A. It is not easy to put the theory into profitable production
B. Wireless recharging needs new theories besides Faraday’s
C. Wireless recharging can’t make profit for businesses
D. It is hard to challenge the monopoly of Splashpower

[单项选择]The hands on my alarm clock are ______, so I can see what time it is in the dark.
A. exotic
B. gorgeous
C. luminous
D. spectacular

[简答题]At times my heart cries out with longing to see all these things. If I can get so much pleasure from mere touch, how much more beauty must be revealed by sight. Yet, those who have eyes apparently see little, the panorama of color and action which fills the world is taken for granted. It is human, perhaps, to appreciate little that which we have and to long for that which we have not, but it is a great pity that in the world of light the gift of sight is used only as a mere conveniences rather than as a means of adding fullness to life.
If I were the president of a university I should establish a compulsory course in "How to Use Your Eyes". The professor would try to show his pupils how they could add joy to their lives by really seeing what passes unnoticed before them. He would try to awake their dormant and sluggish faculties.

[单项选择]My mother cries （） time she sees a sad movie
A. one   
B. once
C. every  
D. all