At 0815，visibility is excellent and you can see Montauk Point. Montauk Point Light is（）.

A. low and rocky with scattered small pine trees

B. a low lying wetland

C. a high sandy bluff

D. a flat wooded plai

At the registration for freshmen in universities, the students reliance on their parents can be witnessed everywhere, from dealing with the detailed issues to the preparation of laptops and cell-phones. It seems that the students do not have to do anything for their starting point at universities, and this has caused widespread discussion about the importance of students independence. Whats your opinion on this problem? Write a composition of about 200 words on the following topic: The Importance of Independence You are to write in three parts. In the first part, state specifically what your opinion is. In the second part, provide one or two reasons to support your opinion. In the last part, bring what you have written to a natural conclusion or make a summary. Marks will be awarded for content, organization, language and appropriateness. Failure to follow the instructions may result in a loss of marks.

II. Concepts: B1-7 (5 points each, 35 points in total) B1. What is the main task of the internet layer in the TCP/IP reference model respectively? What kind of protocol performs that task? B2. Please explain the differences between switches and routers. Hint you: Which layer do they work at? What kind of address do they forward data based on? B3. Why we need media access control? Please list two or more media access control methods. B4. What is the exposed station problem? Please sketch a graph to explain if necessary. B5. Besides flooding, what other routing algorithms have you learned? B6. Transport layer uses both flow control and congestion control. Please tell us what flow control is and what congestion control is? B7. What is the main difference between TCP and UDP?

Horton Point Light ______.

A.is 14 feet above sea level

B.has a fixed green light

C.is shown from a white square tower

D.is synchronized with a radio beacon

Based on your 2209 fix，which would be a warning that you are being set down on Block Island Sound South Entrance Obstruction Lighted BIS Buoy ________．

A.Decreasing loran readings on 9960-W

B.Visual bearings of Montauk Point Lt．changing to the left

C.Increasing bearings of Southeast Point Light

D.Decreasing soundings

The banana "tree" is actually not a real tree. This is because there is no wood in the stem(树干) rising above the ground. The stem is made up of leaves growing very close together, one inside the other. The leaves spread out at the top of the stem and rise in the air.

Banana plants need a lot of care and attention. They must be provided with water if the normal rainfall doesn't supply enough. The area around the plants must be kept free of weeds and grass.

About nine or ten months after planting, a flower appears on the banana plant. This flower is at the end of a long stalk(茎), which grows from the base up through the center of the stem and turns downward when it comes out from the top. Small bananas form. on this flower stalk as it grows down- ward. Bananas really grow upside down. As the small bananas form. on the stalk, they point down- ward, but as they grow they mm and point upward.

Bananas are harvested while they are still green. Even when they are to be eaten where they are grown, they are not allowed to ripen on the plant. A banana that turns yellow on the plant loses its taste.

The first paragraph in the text mainly discusses ______.

A．why the banana tree is not a tree

B．how the banana grows on the stem

C．why the stem of the tree is wood

D．how the leaves grow out of the stem

The closest point of approach ( CPA ) of a contact on a relative motion radar may be determined ______.

A.immediately when the contact is noted on radar

B.only if the radar scope is watched constantly

C.after the contact has been marked at least twice

D.by an occasional glance at the radar