下列有关艾滋病预防的措施，正确的是：
A. 遵守性道德，避免高危性行为，是预防经性途径传播艾滋病毒的根本措施。
B. 严禁吸毒，不与他人共用注射器
C. 对感染艾滋病病毒的孕产妇及时采取抗病毒药物干预，减少产时损伤性操作，避免母乳喂养等预防措施，可大大降低胎儿、婴儿被感染的可能性。
D. 要避免与艾滋病患者的血液、精液、乳汁等体液直接接触
The great wall _________ all over the world.
A. knows
B. knew
C. was known
D. is known
The school bag ____behind the chair.
A. puts
B. can be put
C. can be putted
D. can put
A large number of engineers ____________to Africa by our government to help the people there.
A. have sent
B. will send
C. send
D. are sent
微信支付 
支付宝支付