Millions of people are in danger of getting malaria because______.

A． some countries have not started a campaign against mosquitoes

B． new species of mosquitoes may survive today's sprays

C． malaria was once thought to be a very old evil of the world

D． present sprays are not as effective as people think

[单选题]The equivalents of millions of telephone （ ） are transmitted on a single fiber,thinner than a human hair.A．calls B．lines C．talks D．devices

[单选题]Themillionsofcalculationsinvolved,hadtheybeendonebyhand,__________allpracticalvaluebythetimetheywerefinished.A)hadlostB)wouldhavelostC)wouldloseD)shouldhavelost

[单选题]With hundreds of millions of electronic(71)taking place daily, businesses and organizations have a strong incentive to protect the(72)of the data exchanged in this manner, and to positively ensure the(73)of those involved in the transactions. This ha

[单选题]With hundreds of millions of electronic transactions taking place daily, businesses and organizations have a strong incentive to protect the(66)of the data exchanged in this manner, and to positively ensure the identities of those involved in the(67)

[单选题,共用题干题] With hundreds of millions of electronic (11)taking place daily, businesses and organizations have a strong incentive to protect the. (12) of the data exchanged in this manner, and to positively ensure the (13) of those involved in the transact

[单选题]A．crobats and gymnasts are in danger of hurting themselves in Cirque du Soleil performances because______.A． they haven't practiced enoughB． the equipment is in need of repairsC． they perform. risky acts without netsD． some are HIV positive

[单选题]The captain of the ship _____ the passengers that there was no danger.A.ass

[单选题]What is the principal danger from the liquid in a half full tank onboard a vessel?（）A . Corrosion from the shifting liquidB . Rupturing of bulkheads from the shifting liquidC . Loss of stability from free surface effectD . Holing of the tank bottom f

[单选题]B．This is a song millions of Americans will hear this New Year’s Eve. It is called Auld Lang Syne (《友谊地久天长》). It is the traditional music played during the New Year’s celebration. Auld Lang Syne is an old Scottish poem. It tells about the need to rem

[单选题]Passage FourMillions of stars are traveling about in space. A few form. groups which journey together, but most of them travel alone. And they travel through a universe so large that one star seldom comes near to another.We believe, however, that som