练习:
& S5 Z' a+ H; a% _+ n& h 1. What is the mystery that researchers find hard to explain?
: L" I' ]5 Z* Z7 G5 T" R% p2 q4 G# W8 p A Honeybeesare flying all across the country.
- {! X# D) P8 ~, K" r B 25-40 percent of the honeybees inthe US have died.
6 P. B2 J% R- _8 B' ~2 N C Honeybees are leaving their hives and do not return.% j" \: m6 o! m, P9 e
D Honeybee hives are in disorder.
4 _3 Y; X) U$ s# |! _. ~ P8 k( v4 J! c 2. Why are researchersseriously concerned with the phenomenon of colony-collapsedisorder?
8 z9 y0 z) ~- ]$ j A Because honeybees produce one-third of the foods we eat.
$ s5 D: x$ S- o: [. Z0 }* o+ O3 ~ B Becausehoneybees feed on flowers.( \- g' q, ?0 b. a9 e0 X1 w
C Because honeybees eat seeds of flowers.
2 W4 {6 I/ M2 x( z D Both B and C." \ l- Z+ s5 q9 J, H$ @" B- T& |2 a
3. What are the possible causes of colony-collapsedisorder given by the scientists?
/ T# h/ O; f! C9 l A Worsening environment.% E4 X! U: F, K' q$ s
B Diseaseand chemicals.6 W9 Y' o4 F3 m4 n7 H4 B8 o
C Dwindlingnumber of flowers around.
4 @* [, Q* z V5 i! | D Changes ingenes’ structures.
; d: E9 ] [5 K; N1 F 4. According to the fifth paragraph,which of thefollowing about bees’ genes istrue?- r. t8 C) }5 U7 K, m4 Q- H
A Bees’ genes allow them toexpand their colonies.; Q4 |, `4 k5 @1 m
B Bees’genes help keep them in their hives.1 _" M- w9 t/ a7 B7 [
C Bees’genes make them fly from flower to flower.
( J/ {% V) Z7 n& s3 T5 s! u D Bees’genes couldexplain the collapse of some colonies.
; a, a7 L4 U; @2 P- F3 P 5. What explanation is given byJerry Hayes to the phenomenon?
% I( C. g4 ?; N# v9 y* X: @ A Farmers apply certain chemicals to killunwanted bees.
0 s$ W; Q; x" r, H6 a B The insecticide destroys the honeybee’s nervous system.
/ ~7 u* s/ `+ k" d% ^# ] C The insecticide affects the honeybee’s memory./ m1 U8 T1 J4 F6 l0 s, \
D All of theabove.# p, \$ ?% b3 G* S: o! J- W* o
答案与题解:& ^% n0 J$ C! ^( C" S% L8 D
1. C 短文第一段的第一句和最后一句告诉我们,昆虫学家正面临一个不可解释的谜。第二句解释了这个谜,给出了答案。
6 A4 p# ^+ M9 {; m8 N 2. A 短文第二段的第一句提供了答案。蜜蜂传播花粉能使植物结果,因此为人类提供食物。
* B+ x& q" k/ q1 ~7 G& R. G 3. B 第四段的开头是It could be thatdisease is causing the disappearance of the bees.第五段的开头是Another cause ofcolony-collapse disorder may be certain chemicals that,这是科学家给出的两个可能造成这种现象的原因。" b; o7 f1 ~' ]7 y% n& i- Z
4. D 第六段的句子:bees’genes could explain why some colonies have coilapsed andothcrs have not。这是选择D的依据。选项A、B、C的内容文章中都没有出现,所以不是答案。: |2 |6 m5 }" C
5. D 第五段描述了另一个可能的原因,即农夫使用的杀虫剂可能破坏了蜜蜂的神经系统和记忆。所以D是正确选择。 |