How many vowels are there in A-R?

Only four of the five a, e, I, O, u are vowels

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1. Is the plural of key Keyes or keys?
2. What is key?
3. In the arithmetic sequence, S1 = a1 + A2 + +anS2=a(n+1)+a(n+2)+… +a(2n)S3=a(2n+1)+a(2n+2)+… +A (3n) proves that S1, S2 and S3 are equal
4. The use of dashes in the following is a. sound continuation B. C. meaning transition After listening to the guide's talk, we can't help staring at the willow tree in front of us again - it still stands in the yellow sand, the dense leaves, the stringy branches, the tall and straight body······
5. It is known that P is the point on the ellipse x ^ 2 / 49 + y ^ 2 / 24 = 1, and F1 and F2 are the focal points. If Pf1 is perpendicular to PF2, then the area of triangle pf1f2 is A.28 B.24 C.22 D.20
6. There is a rectangle. The ratio of length to width is 7:5. It is known that the circumference of the rectangle is 48CM. What is the area of the rectangle?
7. It is known that cos (α + π / 4) = 3 / 5, π / 2 ≤ α
8. 1. It is known that the two roots of the equation x ^ 2 + KX + K + 2 = 0 are x1x2 and X1 ^ 2 + x2 ^ 2 = 4 to find the value of K 2. It is known that the sum of squares of the two quadratic equations x ^ 2 + 2 (m-2) x + m ^ + 4 = 0 is 40 greater than the product of the two, so we can find the value of M
9. The image of function y = (3a ^ x-1) - 1 (a is greater than 0 and a is not equal to 1) must pass the fixed point
10. Why should 70 divided by 4 equal 17.5 instead of 17 divided by 2
11. What are the vowels
12. What's in front of vowels Should an or a be added before imaginative and artist
13. Is a vowel?
14. Renai English grade 7 Volume 1, 1, plural nouns ending with "sh, CH, x, s", e.g. nouns ending with consonant + y, e.g Benevolence English grade 7 Volume 1
15. In Book 2, 1, nouns ending with "sh, CH, s, X" become plural. 2, nouns ending with consonant + y become plural all-out!
16. Do verbs ending in 0, x, s, SH, CH, th end in the third person with + es or + S?
17. Write 10 Nouns ending with s, x, CH, sh. then write 10 Nouns ending with consonant + y
18. How many verbs end with s, SH, CH, x, O?
19. Words ending in Sh Better be dish.lish Closing
20. Words ending with ESE, such as Chinese, which country ends with SH and which country ends with CH