[单项选择]Mosquitoes （　） breed in swampy areas.
A. always
B. rarely
C. never
D. generally

[单项选择]

We know mosquitoes very well. Mosquitoes fly everywhere. They can be found almost all over the world, and there are more than 2,500 kinds of them.
No one likes the mosquito. But the mosquito may decide if she loves you. She Yes, she. The male mosquito doesn’t bite! Only the female mosquito bites because she needs blood to lay eggs. She is always looking for things or people she wants to bite. If she likes what she finds, she bites. But if she doesn’t like your blood, she will turn to someone else for more delicious blood. Next time a mosquito bites you, just remember you are chosen. You’re different from the others!
If the mosquito likes you, she lands on your body without letting you know. She bites you so quickly and quietly that you may not feel anything different. After she bites, you will have an itch (痒) on your body because she puts something from her mouth together with your blood. When the itch begins, she has flown away.
And the
A. the male mosquito doesn’t have the ability
B. she needs blood to lay eggs
C. female mosquitoes are stronger than male
D. male mosquitoes are more friendly to people

[单项选择]Mosquitoes are only means of （）of malaria.
A. transference
B. transformation
C. transition
D. transmission

[单项选择]In the swamp the army _____ by mosquitoes.
A. was fallen
B. was beset
C. was worried
D. was set

[单项选择]A. She thinks to breed crops selectively is different from modifying genes of crops.
B. She thinks genetically modified food is not harmful to health.
C. She thinks DNA technology has a negative effect on people’s life.
D. She thinks genetically modified food should be banned from people’s diet.

[单项选择]Birds that breed on high cliffs have pear-shaped eggs that roll in a tight circle, making them（） less likely to roll off the cliff.
A. somewhere
B. sometimes
C. something
D. somewhat

[填空题]The modified "pharm" crops will breed with other crops and produce pharmaceutical drugs that will do great harm,, to consumers.

[单项选择]What was today’s most popular breed of dog, the Labrador was originally bred for（　）.
A. For chasing prey.
B. For herding livestock.
C. Hauling nets and retrieving fish for the fishermen.
D. For keeping accompany.