*15 points *
read this sentence from the section "first tree planted by mrs. taft."
because of this novel characteristic which singles out washington from other cities, coupled with the fact that the trees are now in full splendor, a short history of their appearance in the capital city is of interest.
how does the word "novel" affect the meaning of the sentence?
it suggests that cherry trees grow natively in washington, d. c.
it implies that the cherry trees are a new addition to washington, d. c\
it emphasizes how unusual it is for a u. s. city to have so many cherry trees.
it shows that cherry trees have become common in many u. s. cities.

b. It implies that the cherry trees are a new addition to Washington, D.C.

Explanation:

When the narrator refers to the "novel" characteristic, he/she indicates that this characteristic adds to the exclusivity of Washington D.C (and it is already pretty exclusive, since it is the capital city of U.S.). Moreover, since cherry trees are from Japanese origin, they didn't use to grow up there and these facts distinguish this city from other cities.

greet them:

buenas noches.

that is considered night time which is when "good night" is used.

either a donut or a sphere or a pancake or a flat sphere. it depends on where the vertical line is.

if the line goes through the center of the circle and is perpendicular to a diameter containing the center, then you get a flat circle.

if the line and the diameter of a the circle meet in the center of the diameter and at an angle, you get a pancake.

if the line is on the circumference of the circle and is at right angles   to the circle you get a ring.

if the line contains the diameter, you get a sphere.

the the line is parallel to the diameter and touches the circumference, you get a donut.