[单项选择]Passage Four

What is this passage about a. The development of computer technonogy. b. The development of Symantec Corporation. c. Cyber attacks. d. Computer techniques.

[单项选择]What is this passage about（　）.
A. Buying books.
B. Electronic books.
C. Shopping on the Internet.

[单项选择]What do we learn from the passage about MySpace
A. It’s a reliable way to make friends online.
B. It is convenient to get in touch with their parents.
C. It is regarded as a way of judging high school popularity.
D. It is regarded as a way of judging subject scores.

[单项选择]Passage Four A biological clock is what tells plants, animals, and other organisms how to organize their time. This ‘clock’ helps plants and animals change their routine when they move to places with different climates and environments. Most biological clocks are based on the movement of the sun and follow a twenty-four hour cycle called a circadian rhythm. Some animals sleep only at night, making them diurnal. Animals that sleep during daytime are nocturnal. Flowers are diurnal because they close their petals at night but they open again in the morning. Bats sleep in the daytime so they are nocturnal. Some biological clocks also follow an annual cycle, especially in animals that have annual migrations. Animals that have annual cycles do different things at different times of year. Their actions are determined by the seasons. Different animals can live in the same area when their biological clocks make them look for food at different times of day. This process also
A. Because they look for different types of food.
B. Because their conditions for survival are good.
C. Because they do different things at different times of year.
D. Because their biological clocks keep them out of each other’s way.