选择题：9.为了预防胎儿畸形,孕早期妇女应特别注意( )(本题2.0分)A. 预防病毒感染B. 清淡饮食C.

Now the air pollution in this city ______ more and more serious with each passin

______ the temperature, _______ water turns into steam.A The high， the fastB Hig

We should see ourselves as part of nature rather than in __________ with it. A A

（ ）的网络在完成比较简单的工作中比分权化的网络更快、更准确、也更有效。A A)B B)C C)D D)E E)

The body cannot store vitamin C so it is （）to have a fresh supply every day.A A.