Question

and its steep slopes force rising winds to accelerate.
50
in fact, scientists in 1934 recorded a surface wind
speed (of 231 mph): one of the fastest ever recorded.
51
50.
f. no change
g. its steep slopes that force
h. if its steep slopes force
j. its steep slopes forcing
51.
a. no change
b. speed of 231 mph—
c. speed of 231 mph:
d. speed, of 231 mph,

Explanation:

Question 50

The original sentence structure is "and its steep slopes force rising winds to accelerate". We need to check the subject - verb agreement and the logical relationship. The subject is "its steep slopes" (plural), and the verb "force" is correct in the original. Option G adds "that" which is unnecessary and makes the sentence ungrammatical. Option H changes the subject - verb relationship and the meaning. Option J changes the verb to "forcing" which is incorrect as it would make the sentence lack a main verb. So the original is correct.

The original is "speed (of 231 mph): one of the fastest ever recorded". We need to check the punctuation and the structure. Option B uses a dash which is not appropriate here. Option C uses a colon which is incorrect as the part after the colon should be an explanation, but here it's a continuation. Option D uses a comma which is incorrect as the phrase "of 231 mph" is an appositive and the original parenthetical is correct. Wait, actually, let's re - examine. The original has a colon which is used to introduce an explanation, but the structure "speed (of 231 mph): one of the fastest..." is a bit off. Wait, no, the options: Option A is NO CHANGE. Option B: "speed of 231 mph—" the dash is wrong. Option C: "speed of 231 mph:" the colon is wrong as the next part is not an explanation. Option D: "speed, of 231 mph," the commas are wrong as it's an appositive but the commas would make it non - essential, but it's essential. Wait, actually, the original is using parentheses to set off the "of 231 mph" as additional information, and then the colon to introduce the description. But among the options, the original (Option A) is the best? Wait no, let's check the options again. Wait, the original is "speed (of 231 mph): one of the fastest ever recorded". The options: A is NO CHANGE. B: speed of 231 mph—. C: speed of 231 mph:. D: speed, of 231 mph,. The correct structure should be that "of 231 mph" is an appositive to "speed", and the original uses parentheses which is correct. But wait, maybe I made a mistake. Wait, the intended meaning is to give the speed (231 mph) and then say it's one of the fastest. The original structure with parentheses is correct. So the answer is A.

Answer:

F. NO CHANGE

Question 51