问题
单项选择题
贾第虫区别于其他人体肠内原虫的形态特征是
A．具有不定形的伪足
B．具有一个吸盘与两个核
C．圆形体
D．具有纤毛
E．具有特殊的波动膜
答案
参考答案：B
搜题请搜索小程序“爱下问搜题”
贾第虫区别于其他人体肠内原虫的形态特征是
A．具有不定形的伪足
B．具有一个吸盘与两个核
C．圆形体
D．具有纤毛
E．具有特殊的波动膜
参考答案：B
| 完形填空 | |||
| Scientists are trying to make the desert into good land again.They want to bring 1to the desert. So people can live and 2food.They are working a lot on the desert.But more and more ground 3 desert all the time.Scientists may not be able to change the desert 4 time. Why is more and more land becoming 5? Scientists think that 6 make desert.People are doing 7 things to the earth. Some places on the earth don't have many rivers.8they still don't become desert.This is because some green plants are growing there.Small green plants and grasses are very important to bad places.9 don't let the hot sun make the earth even drier.Plants don't let the wind 10 the dirt away.When a little bit of rain fall,the plants hold the water.Without plants,the land can become a desert much more easily. | |||
| ( )1.A.air ( )2.A.grow ( )3.A.becomes ( )4.A.on ( )5.A.rivers ( )6.A.people ( )7.A.good ( )8.A.And ( )9.A.Plants ( )10.A.to blow | B.water B.plant B.became B.in B.mountains B.animals B.bad B.So B.Animals B.blow | C.food C.eat C.becoming C.for C.desert C.plants C.nice C.But C.People C.blowing | D.sun D.cook D.is becoming D.at D.hole D.birds D.a lot of D.Because D.Birds D.blows |