PartIVTranslation：

Almost30millionAmericansweightatleast20percentmorethantheiridealweight.Infact,theUnitedStateisthemostoverweightcountryinthewild.(PassageThree)

衡量胎先露下降程度的重要指标是：

以下哪一项是原发性呼吸暂停而不是继发性呼吸暂停的特征?

先兆临产表现()、胎儿下降感、()。

PartIVTranslation

Bymeasuringandchartingtheresultsofmanyexperiments,theyaretryingtofindoutwhatmakesdifferentpeopleperceivetotallydifferentthingsaboutthesamescene.(PassageOne)