[E]OG-44，请指点！

excellent · 发表于 2004-1-19 09:49:00

44. Using a Doppler ultrasound device, fetal heartbeats can be detected by the twelfth week of pregnancy.
A.Using a Doppler ultrasound device, fetal heart-beats can be detected by the twelfth week of pregnancy.
B.Fetal heartbeats can be detected by the twelfth week of pregnancy, using a Doppler ultrasound device.
C.Detecting fetal heartbeats by the twelfth week of pregnancy, a physician can use a Doppler ultrasound device.
D.By the twelfth week of pregnancy, fetal heartbeats can be detected using a Doppler ultrasound device by a physician.
E.Using a Doppler ultrasound device, a physician can detect fetal heartbeats by the twelfth week of pregnancy.

答案是E。E中的by是什么意思？by the twelfth week of pregnancy这是一种什么样的表达方法？有谁能讲讲吗？

rabbitbug · 发表于 2004-1-20 18:54:00

by + 时间有两个意思： “在...时间内”和“到...为止”。最好的分辨方法是句子的逻辑意思。本题来说，意思是“到怀孕的第12个星期为止，医生就可以通过...东东探测出...”.这里的“by”就是“到...为止的”意思。
He sleeps by day. 意思是“他在白天睡觉”。

jzchina · 发表于 2005-7-17 12:35:00

關於這道題的答案c，og的解釋是choice c suggests that physicians can use a doppler ultrasound device after they detect fetal heartbeats.選項c“Detecting fetal heartbeats by the twelfth week of pregnancy, a physician can use a Doppler ultrasound device.”是邏輯主語結構，主語主語是detecting...的邏輯主語，但是它們之間沒有先後關係的問題吧？請指點！

[E]OG-44，请指点！

[E]OG-44，请指点！

所属分类: 下线版块

正在浏览此版块的会员 ()