练习: 1. Paragraphs 2 and 3 </p> 2. Paragraph 4 ! c2 \, G# e4 T1 i; g! o
3. Paragraph 5 : r1 ~& O% s7 v" _
4. Paragraph 6
- Y5 j0 ]8 I* z5 K9 h% w5 h. L& v A Cloud-to-ground lightning occurring in the U.S. " n5 e: U1 l7 a6 s( b6 R# v5 p' P5 y
B Types of lightning 6 j6 E9 \8 D4 s# T9 o2 n8 q$ b, i* }
C Cause of lightning ' i, m+ g8 e0 p/ k4 C
D Differences between thunder and thunderstorm
" m9 {( j- H3 F- h E Frequencies of thunderstorms occurring in the world and the U.S.
& I6 k) W' v' P( R0 s F Shock waves as thunder
; s/ @, s* p) \4 Q/ S 5. In most cases of cloud-to-ground lightning, the ground s surface … N$ w8 J3 [" E1 Z H* a: ]0 S8 U
6. One form of lightning that … is ball lightning … , N( c6 r7 s3 U2 E! H& Z$ A7 `
7. Cloud lightning looks like a ribbon when its lighting channel … & U. K' K' `/ c! E/ Q
8. Although not fully understanding processes of lightning, man …
8 ~$ ^1 E, @9 a% F \) J A occurs most infrequently.
5 H$ ~7 n) f8 _3 ` V, I% @ B is shifted sideways by strong winds. 中华考试网(www.Examw。com)
# j/ G! S" v$ `/ W; Q- | C is often hidden from our view.
7 @8 b1 u( x$ W) d) z) V/ p D is equipped with a good knowledge of various forms of lightning . 1 B6 M7 p- \$ J @# t0 Y# x& o4 C
E is estimated at 20 millions a year. # t; j; P! M& S* N& Z
F is positively charged. + W& ~6 p, t6 E5 _" |. X" n( |, Z# c5 l
参考答案:CBFE FABD |